Fix unshare link click element

When clicking on the unshare link (trash icon), the correct link element
needs to be used instead of whatever child was clicked. Then, that
element might contain a visible loading icon.

This fixes the spinner detection and also prevents a full page reload in
case the spinner was visible.

core/js/sharedialogshareelistview.js

@@ -245,12 +245,14 @@
 
 		onUnshare: function(event) {
 			var $element = $(event.target);
-			console.log($element);
+			if (!$element.is('a')) {
+				$element = $element.closest('a');
+			}
 
-			var $loading = $element.siblings('.icon-loading-small').eq(0);
+			var $loading = $element.find('.icon-loading-small').eq(0);
 			if(!$loading.hasClass('hidden')) {
 				// in process
-				return;
+				return false;
 			}
 			$loading.removeClass('hidden');