removed unused variable from joystickconfigcontroller.

src/VehicleSetup/JoystickConfigController.cc

@@ -16,7 +16,6 @@
 
 QGC_LOGGING_CATEGORY(JoystickConfigControllerLog, "JoystickConfigControllerLog")
 
-const int JoystickConfigController::_updateInterval =       150;        ///< Interval for timer which updates radio channel widgets
 const int JoystickConfigController::_calCenterPoint =       0;
 const int JoystickConfigController::_calValidMinValue =     -32768;     ///< Largest valid minimum axis value
 const int JoystickConfigController::_calValidMaxValue =     32767;      ///< Smallest valid maximum axis value

src/VehicleSetup/JoystickConfigController.h

@@ -208,8 +208,6 @@ private:
     static const char* _imagePitchUp;
     static const char* _imagePitchDown;
     
-    static const int _updateInterval;   ///< Interval for ui update timer
-    
     int _rgFunctionAxisMapping[Joystick::maxFunction]; ///< Maps from joystick function to axis index. _axisMax indicates axis not set for this function.
 
     static const int _attitudeControls = 5;