Fix backlight issue when storage is erased

and crash on PWR button press while a full-screen dialog is displayed.

radio/src/gui/colorlcd/fullscreen_dialog.cpp

@@ -162,7 +162,8 @@ void FullScreenDialog::runForever()
 #endif
     }
     else if (check == e_power_press) {
-      RTOS_WAIT_MS(20);
+      WDG_RESET();
+      RTOS_WAIT_MS(1);
       continue;
     }
 
@@ -193,6 +194,7 @@ void FullScreenDialog::runForeverNoPwrCheck()
 
 void raiseAlert(const char * title, const char * msg, const char * action, uint8_t sound)
 {
+  TRACE("raiseAlert('%s')", msg);
   AUDIO_ERROR_MESSAGE(sound);
   auto dialog = new FullScreenDialog(WARNING_TYPE_ALERT, title ? title : "",
                                      msg ? msg : "", action ? action : "");

radio/src/storage/sdcard_common.cpp

@@ -39,11 +39,18 @@ void storageEraseAll(bool warn)
 {
   TRACE("storageEraseAll");
 
-#if defined(LIBOPENUI)
+#if defined(COLORLCD)
   // the theme has not been loaded before
   static_cast<OpenTxTheme*>(theme)->load();
 #endif
 
+  // Init backlight mode before entering alert screens
+  requiredBacklightBright = BACKLIGHT_FORCED_ON;
+
+#if defined(PCBHORUS)
+  g_eeGeneral.blOffBright = 20;
+#endif
+
   if (warn) {
     ALERT(STR_STORAGE_WARNING, STR_BAD_RADIO_DATA, AU_BAD_RADIODATA);
   }