GCS_MAVLink: handle CAN_FILTER_MODIFY call

libraries/GCS_MAVLink/GCS_Common.cpp

@@ -3721,6 +3721,12 @@ void GCS_MAVLINK::handle_common_message(const mavlink_message_t &msg)
     case MAVLINK_MSG_ID_CAN_FRAME:
         handle_can_frame(msg);
         break;
+
+    case MAVLINK_MSG_ID_CAN_FILTER_MODIFY:
+#if HAL_CANMANAGER_ENABLED
+        AP::can().handle_can_filter_modify(msg);
+#endif
+        break;
     }
 
 }