add min width to multiselect in user management

settings/js/users.js

@@ -32,7 +32,8 @@ $(document).ready(function(){
 			createText:'add group',
 			checked:checked,
 			oncheck:checkHandeler,
-			 onuncheck:checkHandeler
+			onuncheck:checkHandeler,
+			minWidth: 100,
 		});
 	}
 	$('select[multiple]').each(function(index,element){