Plane: added QRTL as RCn_OPTION

ArduPlane/RC_Channel.cpp

@@ -154,6 +154,9 @@ void RC_Channel_Plane::init_aux_function(const RC_Channel::aux_func_t ch_option,
     case AUX_FUNC::RTL:
     case AUX_FUNC::TAKEOFF:
     case AUX_FUNC::FBWA:
+#if HAL_QUADPLANE_ENABLED
+    case AUX_FUNC::QRTL:
+#endif
     case AUX_FUNC::FBWA_TAILDRAGGER:
     case AUX_FUNC::FWD_THR:
     case AUX_FUNC::LANDING_FLARE:
@@ -252,6 +255,12 @@ bool RC_Channel_Plane::do_aux_function(const aux_func_t ch_option, const AuxSwit
         do_aux_function_change_mode(Mode::Number::FLY_BY_WIRE_A, ch_flag);
         break;
 
+#if HAL_QUADPLANE_ENABLED
+    case AUX_FUNC::QRTL:
+        do_aux_function_change_mode(Mode::Number::QRTL, ch_flag);
+        break;
+#endif
+
     case AUX_FUNC::SOARING:
         do_aux_function_soaring_3pos(ch_flag);
         break;