Correct Kconfigs according to the coding style

* Original commit: espressif/esp-idf@37126d3451

components/freemodbus/Kconfig

@@ -1,6 +1,6 @@
 menu "Modbus configuration"
 
-config MB_QUEUE_LENGTH
+    config MB_QUEUE_LENGTH
         int "Modbus serial task queue length"
         range 0 200
         default 20
@@ -8,7 +8,7 @@ config MB_QUEUE_LENGTH
             Modbus serial driver queue length. It is used by event queue task.
             See the serial driver API for more information.
 
-config MB_SERIAL_TASK_STACK_SIZE
+    config MB_SERIAL_TASK_STACK_SIZE
         int "Modbus serial task stack size"
         range 768 8192
         default 2048
@@ -16,7 +16,7 @@ config MB_SERIAL_TASK_STACK_SIZE
             Modbus serial task stack size for event queue task.
             It may be adjusted when debugging is enabled (for example).
 
-config MB_SERIAL_BUF_SIZE
+    config MB_SERIAL_BUF_SIZE
         int "Modbus serial task RX/TX buffer size"
         range 0 2048
         default 256
@@ -25,7 +25,7 @@ config MB_SERIAL_BUF_SIZE
             This buffer is used for Modbus frame transfer. The Modbus protocol maximum
             frame size is 256 bytes. Bigger size can be used for non standard implementations.
 
-config MB_SERIAL_TASK_PRIO
+    config MB_SERIAL_TASK_PRIO
         int "Modbus serial task priority"
         range 3 10
         default 10
@@ -33,14 +33,14 @@ config MB_SERIAL_TASK_PRIO
             Modbus UART driver event task priority.
             The priority of Modbus controller task is equal to (CONFIG_MB_SERIAL_TASK_PRIO - 1).
 
-config MB_CONTROLLER_SLAVE_ID_SUPPORT
+    config MB_CONTROLLER_SLAVE_ID_SUPPORT
         bool "Modbus controller slave ID support"
         default n
         help
             Modbus slave ID support enable.
             When enabled the Modbus <Report Slave ID> command is supported by stack.
 
-config MB_CONTROLLER_SLAVE_ID
+    config MB_CONTROLLER_SLAVE_ID
         hex "Modbus controller slave ID"
         range 0 4294967295
         default 0x00112233
@@ -51,7 +51,7 @@ config MB_CONTROLLER_SLAVE_ID
             Most significant byte of ID is used as short device ID and
             other three bytes used as long ID.
 
-config MB_CONTROLLER_NOTIFY_TIMEOUT
+    config MB_CONTROLLER_NOTIFY_TIMEOUT
         int "Modbus controller notification timeout (ms)"
         range 0 200
         default 20
@@ -59,7 +59,7 @@ config MB_CONTROLLER_NOTIFY_TIMEOUT
             Modbus controller notification timeout in milliseconds.
             This timeout is used to send notification about accessed parameters.
 
-config MB_CONTROLLER_NOTIFY_QUEUE_SIZE
+    config MB_CONTROLLER_NOTIFY_QUEUE_SIZE
         int "Modbus controller notification queue size"
         range 0 200
         default 20
@@ -67,7 +67,7 @@ config MB_CONTROLLER_NOTIFY_QUEUE_SIZE
             Modbus controller notification queue size.
             The notification queue is used to get information about accessed parameters.
 
-config MB_CONTROLLER_STACK_SIZE
+    config MB_CONTROLLER_STACK_SIZE
         int "Modbus controller stack size"
         range 0 8192
         default 4096
@@ -75,7 +75,7 @@ config MB_CONTROLLER_STACK_SIZE
             Modbus controller task stack size. The Stack size may be adjusted when
             debug mode is used which requires more stack size (for example).
 
-config MB_EVENT_QUEUE_TIMEOUT
+    config MB_EVENT_QUEUE_TIMEOUT
         int "Modbus stack event queue timeout (ms)"
         range 0 500
         default 20
@@ -83,14 +83,14 @@ config MB_EVENT_QUEUE_TIMEOUT
             Modbus stack event queue timeout in milliseconds. This may help to optimize
             Modbus stack event processing time.
 
-config MB_TIMER_PORT_ENABLED
+    config MB_TIMER_PORT_ENABLED
         bool "Modbus stack use timer for 3.5T symbol time measurement"
         default y
         help
             If this option is set the Modbus stack uses timer for T3.5 time measurement.
             Else the internal UART TOUT timeout is used for 3.5T symbol time measurement.
 
-config MB_TIMER_GROUP
+    config MB_TIMER_GROUP
         int "Modbus Timer group number"
         range 0 1
         depends on MB_TIMER_PORT_ENABLED
@@ -98,7 +98,7 @@ config MB_TIMER_GROUP
         help
             Modbus Timer group number that is used for timeout measurement.
 
-config MB_TIMER_INDEX
+    config MB_TIMER_INDEX
         int "Modbus Timer index in the group"
         range 0 1
         depends on MB_TIMER_PORT_ENABLED