Fix Icinga1 Classic UI toggle menu bug

# https://dev.icinga.com/issues/11732

diff  /usr/share/icinga/htdocs/js/menu.js.2016-12-13 /usr/share/icinga/htdocs/js/menu.js
10,18c10,21
< 		elem.prepend( img )
< 			.css( "cursor", "pointer" )
< 			.toggle( function() {
< 				img.attr('src', 'images/menu_more.gif');
< 				list.slideToggle("slow");
< 			}, function() {
< 				img.attr('src', 'images/menu_less.gif');
< 				list.slideToggle("slow");
< 		});
---
>                elem.prepend( img )
>                        .css( "cursor", "pointer" )
>                        .click( function() {
>                                if($(this).hasClass("collapsed")) {
>                                        img.attr('src', 'images/menu_less.gif');
>                                        $(this).removeClass("collapsed");
>                                } else {
>                                        img.attr('src', 'images/menu_more.gif');
>                                        $(this).addClass("collapsed");
>                                }
>                                list.slideToggle("slow");
>                        });