LibWeb+WebContent: Delete unused "has focus" flag from paint config

Author: https://github.com/kalenikaliaksandr
Commit: b73525ba0e
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/5259
Reviewed-by: https://github.com/gmta ✅

Libraries/LibWeb/DOM/Document.h

@@ -835,7 +835,6 @@ public:
     struct PaintConfig {
         bool paint_overlay { false };
         bool should_show_line_box_borders { false };
-        bool has_focus { false };
         Optional<Gfx::IntRect> canvas_fill_rect {};
 
         bool operator==(PaintConfig const& other) const = default;