fix lookup for insertion

something has been changed in the HTML.  The lookup for the target element to insert the approvers was failing.
This has been fixed with this commit.

show-approvals-at merge-requests.user.js

@@ -34,7 +34,7 @@
         jQuery.ajax({
             url : apiUrl,
             success : function(data){
-                let iconTarget = $mergeR.find('.title .controls');
+                let iconTarget = $mergeR.find('.controls');
                 iconTarget.append('<li style="max-height: 20px;overflow-y: hidden;"><div class="approvers-list" style="display:flex"></div></li>');
                 iconTarget = iconTarget.find('.approvers-list');
 
@@ -54,4 +54,4 @@
             }
         });
     });
-})();
+})();