Add property to disable joystickinput

Set that property to false by default to disable stray joystick input (closes #1370)

include/openspace/interaction/navigationhandler.h

@@ -166,7 +166,8 @@ private:
 
     std::optional<NavigationState> _pendingNavigationState;
 
-    properties::BoolProperty _disableInputs;
+    properties::BoolProperty _disableMouseInputs;
+    properties::BoolProperty _disableJoystickInputs;
     properties::BoolProperty _useKeyFrameInteraction;
 };