MAGIC value for powerReason should be stored in RTC backup on Horus (#7096)

- Allows the radio main application to start correctly when coming from an app in RAM
- Refactoring of the `UNEXPECTED_SHUTDOWN()` process
- Saves the RTC battery as BACKUP RAM is not needed on normal shutdown
- On PWR OFF on an ALERT, the radio won't show the next alert before shutting down
- Bootloader flashable through the SD Manager

radio/src/gui/common/stdlcd/view_text.cpp

@@ -44,7 +44,7 @@ void readModelNotes()
     menuTextView(event);
     event = getEvent();
     lcdRefresh();
-    wdt_reset();
+    WDG_RESET();
   }
 
   LED_ERROR_END();