GMLCompiler: Add enum initializer for background_role

Author: https://github.com/mrunix00
Commit: f6c32ea45e
Pull-request: https://github.com/SerenityOS/serenity/pull/22512
Reviewed-by: https://github.com/timschumi ✅

Meta/Lagom/Tools/CodeGenerators/GMLCompiler/main.cpp

@@ -174,6 +174,7 @@ static ErrorOr<Optional<String>> generate_enum_initializer_for(StringView proper
     static HashMap<StringView, StringView> enum_properties = {
         { "text_alignment"sv, "Gfx::TextAlignment"sv },
         { "focus_policy"sv, "GUI::FocusPolicy"sv },
+        { "background_role"sv, "Gfx::ColorRole"sv },
         { "foreground_role"sv, "Gfx::ColorRole"sv },
         { "frame_style"sv, "Gfx::FrameStyle"sv },
         { "text_wrapping"sv, "Gfx::TextWrapping"sv },