Fix backlight issue when storage is erased

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

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);
   }