Fix crash on switching camera

- Use current fragment instead of null support fragment

Co-authored-by: Root Down Digital <[email protected]>

Author: lukeswitz

src/main/java/org/havenapp/main/ui/CameraConfigureActivity.java

@@ -101,7 +101,7 @@ private void switchCamera() {
         else if (camera.equals(PreferenceManager.BACK))
             mPrefManager.setCamera(PreferenceManager.FRONT);
 
-        ((CameraFragment) getSupportFragmentManager().findFragmentById(R.id.fragment_camera)).updateCamera();
+        mFragment.updateCamera();
         setResult(RESULT_OK);
     }