SDL2: Force user to recalibrate on SDL2 update.

src/Joystick/Joystick.cc

@@ -19,7 +19,7 @@ QGC_LOGGING_CATEGORY(JoystickLog, "JoystickLog")
 QGC_LOGGING_CATEGORY(JoystickValuesLog, "JoystickValuesLog")
 
 const char* Joystick::_settingsGroup =              "Joysticks";
-const char* Joystick::_calibratedSettingsKey =      "Calibrated";
+const char* Joystick::_calibratedSettingsKey =      "Calibrated1"; // Increment number to force recalibration
 const char* Joystick::_buttonActionSettingsKey =    "ButtonActionName%1";
 const char* Joystick::_throttleModeSettingsKey =    "ThrottleMode";
 const char* Joystick::_exponentialSettingsKey =     "Exponential";
@@ -369,6 +369,11 @@ void Joystick::startPolling(Vehicle* vehicle)
         // Always set up the new vehicle
         _activeVehicle = vehicle;
 
+        // If joystick is not calibrated, disable it
+        if ( !_calibrated ) {
+            vehicle->setJoystickEnabled(false);
+        }
+
         // Only connect the new vehicle if it wants joystick data
         if (vehicle->joystickEnabled()) {
             _pollingStartedForCalibration = false;