LibGUI+Userland: Make Dialog::ExecResult an enum class

Author: https://github.com/AtkinsSJ
Commit: cdffe556c8
Pull-request: https://github.com/SerenityOS/serenity/pull/14021
Reviewed-by: https://github.com/linusg ✅

Userland/Libraries/LibGUI/SettingsWindow.cpp

@@ -81,10 +81,10 @@ ErrorOr<NonnullRefPtr<SettingsWindow>> SettingsWindow::create(String title, Show
 
         auto result = MessageBox::show(window, "Apply these settings before closing?", "Unsaved changes", MessageBox::Type::Warning, MessageBox::InputType::YesNoCancel);
         switch (result) {
-        case MessageBox::ExecYes:
+        case MessageBox::ExecResult::Yes:
             window->apply_settings();
             return Window::CloseRequestDecision::Close;
-        case MessageBox::ExecNo:
+        case MessageBox::ExecResult::No:
             window->cancel_settings();
             return Window::CloseRequestDecision::Close;
         default: