Merge pull request #2956 from DonLakeFlyer/SimpleFMLogic

Simple FM config: Show Advanced if older firmware

src/AutoPilotPlugins/PX4/PX4FlightModes.qml

@@ -43,7 +43,7 @@ QGCView {
     property Fact _nullFact
     property Fact _rcMapFltmode:    controller.parameterExists(-1, "RC_MAP_FLTMODE") ? controller.getParameterFact(-1, "RC_MAP_FLTMODE") : _nullFact
     property Fact _rcMapModeSw:     controller.getParameterFact(-1, "RC_MAP_MODE_SW")
-    property bool _simpleMode:      _rcMapFltmode.value > 0 || _rcMapModeSw.value == 0
+    property bool _simpleMode:      controller.parameterExists(-1, "RC_MAP_FLTMODE") && _rcMapFltmode.value > 0
 
     QGCPalette { id: qgcPal; colorGroupEnabled: panel.enabled }