LibGUI: Port rest of the classes to property deserializers

Author: https://github.com/DanShaders
Commit: 1f4b15dcaa
Pull-request: https://github.com/SerenityOS/serenity/pull/21812
Reviewed-by: https://github.com/ADKaster ✅

Userland/Libraries/LibGUI/Widget.h

@@ -254,7 +254,6 @@ public:
     Gfx::ColorRole foreground_role() const { return m_foreground_role; }
     void set_foreground_role(Gfx::ColorRole);
 
-    bool set_background_color(String);
     void set_background_color(Gfx::Color);
 
     void set_autofill(bool b) { set_fill_with_background_color(b); }