Remove the Exit button on app store builds (review guidelines)

UI/MainScreen.cpp

@@ -1279,7 +1279,10 @@ void MainScreen::CreateViews() {
 	}
 
 	rightColumnChoices->Add(new Spacer(25.0));
+#if !PPSSPP_PLATFORM(IOS_APP_STORE)
+	// Officially, iOS apps should not have exit buttons. Remove it to maximize app store review chances.
 	rightColumnChoices->Add(new Choice(mm->T("Exit")))->OnClick.Handle(this, &MainScreen::OnExit);
+#endif
 
 	if (vertical) {
 		root_ = new LinearLayout(ORIENT_VERTICAL);