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/Applications/FileManager/FileUtils.cpp

@@ -32,7 +32,7 @@ void delete_paths(Vector<String> const& paths, bool should_confirm, GUI::Window*
             "Confirm deletion",
             GUI::MessageBox::Type::Warning,
             GUI::MessageBox::InputType::OKCancel);
-        if (result == GUI::MessageBox::ExecCancel)
+        if (result == GUI::MessageBox::ExecResult::Cancel)
             return;
     }