PX4SimpleFlightModes.qml: Rename the variable for bugfix

This was introduced in
d5dc4f1af1,
and the refactor didn't fix the case for RC_MAP_FLAPS case correctly,
leading to the bug report: https://github.com/PX4/PX4-Autopilot/issues/21927

src/AutoPilotPlugins/PX4/PX4SimpleFlightModes.qml

@@ -34,8 +34,8 @@ Item {
             _switchTHList.push("RC_TRANS_TH")
         }
         if (controller.vehicle.fixedWing) {
-            _switchFactList.push("RC_MAP_FLAPS")
-            _switchTHFactList.push("")
+            _switchNameList.push("RC_MAP_FLAPS")
+            _switchTHList.push("")
         }
         switchRepeater.model = _switchNameList
     }