gui: Show xattr filter editor when send xattrs checked (fixes syncthing#8958) (syncthing#8959)

Author: calmh

gui/default/syncthing/folder/editFolderModalView.html

@@ -324,7 +324,7 @@
             </div>
           </div>
 
-          <div class="row" ng-if="currentFolder.syncXattrs">
+          <div class="row" ng-if="currentFolder.syncXattrs || currentFolder.sendXattrs">
             <div class="col-md-12">
               <p>
                 <label translate>Extended Attributes Filter</label>