Only pop up the config save error after main and settings screens.

UI/MainScreen.cpp

@@ -1409,7 +1409,9 @@ UI::EventReturn MainScreen::OnForums(UI::EventParams &e) {
 
 UI::EventReturn MainScreen::OnExit(UI::EventParams &e) {
 	// Let's make sure the config was saved, since it may not have been.
-	g_Config.Save("MainScreen::OnExit");
+	if (!g_Config.Save("MainScreen::OnExit")) {
+		System_SendMessage("toast", "Failed to save settings!\nCheck permissions, or try to restart the device.");
+	}
 
 	// Request the framework to exit cleanly.
 	System_SendMessage("finish", "");