Blimp: make bad-mode-number notification consistent across vehicles

Blimp/mode.cpp

@@ -62,8 +62,7 @@ bool Blimp::set_mode(Mode::Number mode, ModeReason reason)
 
     Mode *new_flightmode = mode_from_mode_num((Mode::Number)mode);
     if (new_flightmode == nullptr) {
-        gcs().send_text(MAV_SEVERITY_WARNING,"No such mode");
-        AP::logger().Write_Error(LogErrorSubsystem::FLIGHT_MODE, LogErrorCode(mode));
+        notify_no_such_mode((uint8_t)mode);
         return false;
     }