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/DevTools/HackStudio/Dialogs/Git/GitCommitDialog.cpp

@@ -39,11 +39,11 @@ GitCommitDialog::GitCommitDialog(GUI::Window* parent)
     m_commit_button->set_enabled(!m_message_editor->text().is_empty() && on_commit);
     m_commit_button->on_click = [this](auto) {
         on_commit(m_message_editor->text());
-        done(ExecResult::ExecOK);
+        done(ExecResult::OK);
     };
 
     m_cancel_button->on_click = [this](auto) {
-        done(ExecResult::ExecCancel);
+        done(ExecResult::Cancel);
     };
 }