JS/IE8: fix IE8 error caused by focus()

No more error when using the jQuery wrapper. Focus handling is pretty
outdated, needs special care as soon as we have auto-refreshing search
fields.

public/js/icinga/loader.js

@@ -612,7 +612,7 @@
                 $container.scrollTop(scrollPos);
             }
             if (origFocus) {
-                origFocus.focus();
+                $(origFocus).focus();
             }
 
             // TODO: this.icinga.events.refreshContainer(container);