add rc disable

libraries/RC_Channel/RC_Channel.cpp

@@ -136,14 +136,12 @@ RC_Channel::update(void)
     if (has_override() && !rc().ignore_overrides()) {
         radio_in = override_value;
     } else if (!rc().ignore_receiver()) {
-        radio_in = hal.rcin->read(ch_in);
+        if(rc().ignore_ctrl_channel() && ch_in < 6){
-    } else if(rc().ignore_ctrl_channel()){
-        if(ch_in < 7)
             return false;
-        else
+        }else{
             radio_in = hal.rcin->read(ch_in);
         }
-    else {
+    }else {
         return false;
     }