use correct app-icon class for new apps as well, fix icon size

settings/js/apps.js

@@ -283,7 +283,7 @@ OC.Settings.Apps = OC.Settings.Apps || {
 					if(container.children('li[data-id="'+entry.id+'"]').length === 0){
 						var li=$('<li></li>');
 						li.attr('data-id', entry.id);
-						var img= $('<img class="icon"/>').attr({ src: entry.icon});
+						var img= $('<img class="app-icon"/>').attr({ src: entry.icon});
 						var a=$('<a></a>').attr('href', entry.href);
 						var filename=$('<span></span>');
 						filename.text(entry.name);