Removed warning when toggling from remote-control mode to simulation mode

-Added empty node CameraZoom to the camera in the proto in order to avoid a warning (WARNING: DARwInOP (PROTO) > DEF DNeck Servo > DEF DHead Servo > Camera: wb_camera_set_fov() cannot be applied to this camera: missing 'zoom'.) when toggling from remote-control mode to simulation mode
-Updated changelog.