Rover: stop passing dataflash into handle_radio_status

APMrover2/GCS_Mavlink.cpp

@@ -997,7 +997,7 @@ void GCS_MAVLINK_Rover::handleMessage(mavlink_message_t* msg)
     case MAVLINK_MSG_ID_RADIO:
     case MAVLINK_MSG_ID_RADIO_STATUS:
         {
-            handle_radio_status(msg, rover.logger, rover.should_log(MASK_LOG_PM));
+            handle_radio_status(msg, rover.should_log(MASK_LOG_PM));
             break;
         }