[Gtk4] Condense Menu sizes

Gtk 4.x by default uses far more space than on Gtk 3.x thus make it
smaller to be closer to how menu looks on Gtk 3.

Author: akurtakov

bundles/org.eclipse.swt/Eclipse SWT PI/gtk/org/eclipse/swt/internal/gtk/swt_theming_fixes_gtk_4_0_0.css

@@ -4,4 +4,9 @@ button.toggle {
 button {
 	min-height: 0px;
 	min-width: 0px;
-}
+}
+modelbutton {
+    padding-top: 2px;
+    padding-bottom: 2px;
+    min-height: 0;
+}