Fix issue: LED bar button test pressed but WiFi connection still perform.

src/AgConfigure.cpp

@@ -1193,7 +1193,7 @@ int Configuration::getDisplayBrightness(void) {
 
 bool Configuration::isOfflineMode(void) {
   bool offline = jconfig[jprop_offlineMode];
-  return offline;
+  return (offline || _offlineMode);
 }
 
 void Configuration::setOfflineMode(bool offline) {
@@ -1202,6 +1202,10 @@ void Configuration::setOfflineMode(bool offline) {
   saveConfig();
 }
 
+void Configuration::setOfflineModeWithoutSave(bool offline) {
+  _offlineMode = offline;
+}
+
 bool Configuration::isDisplayBrightnessChanged(void) {
   bool changed = displayBrightnessChanged;
   displayBrightnessChanged = false;