Not to show "Failsafe - No RC" when FS long action set to Auto

When flight controller is set to continue if RC signal is lost, then red "Failsafe - No RC" message on HUD isn't informative and only diverts operator attention in flight. It may be shown in blue for few seconds after RxRSSI turns to 0 just to inform operator about RC range reached.

Start by tracing where the HUD displays the red "Failsafe - No RC" message and how it reads the flight controller's FS long action setting. Reproduce the case with that setting on Auto and RxRSSI reaching 0; done means the warning is not shown in red during the configured behavior, while the requested brief blue notification remains addressed.

Written by the indexing model from the issue text.