Squish: Use parameters in some calls to mouseClick(...)

Partially reverts e8727fcae2 for these lines.

Change-Id: I268b1ff337095bd08d3e92c8be57bc2b6e5de8d9
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

tests/system/shared/utils.py

@@ -99,7 +99,8 @@ def selectFromCombo(objectSpec, itemName):
     else:
         mouseClick(object)
         snooze(1)
-        mouseClick(waitForObjectItem(object, itemName.replace(".", "\\.")))
+        # params required here
+        mouseClick(waitForObjectItem(object, itemName.replace(".", "\\.")), 5, 5, 0, Qt.LeftButton)
         test.verify(waitFor("str(object.currentText)==itemName", 5000),
                     "Switched combo item to '%s'" % itemName)
         return True