pygimp: use the new width/height properties instead of poking into the button

plug-ins/pygimp/gimpui.override

@@ -972,11 +972,11 @@ _wrap_gimp_color_button_new(PyGObject *self, PyObject *args, PyObject *kwargs)
                             "title",       title,
                             "type",        type,
                             "color",       color,
+                            "area-width",  width,
+			    "area-height", height,
                             NULL))
         return -1;
 
-    gtk_widget_set_size_request(GIMP_COLOR_BUTTON(self->obj)->color_area,
-                                width, height);
     return 0;
 }
 %%