[xmosaicframe] add a button to remove a frame (closes #289628)

1              qs('#panel').style.display = 'block';
2              qs('form').style.display = 'none';
3              queryUpdated(host, ownerDocument, registry);
4              e.preventDefault();
5          });
6 +        qs('#remove-frame').addEventListener('click', function(e) {
7 +            host.remove();
8 +        });
9      }
10 
11 
12      function queryUpdated(host, ownerDocument, registry) {
13          let sourceviews = registry.views[host.dataset.source],

14  		aria-expanded="false">View <span class="caret"></span>
15  	</button>
16  	<ul id="view-menu" class="dropdown-menu" role="menu">
17  	</ul>
18        </div>
19 +      <button id="remove-frame" class="btn btn-default glyphicon glyphicon-remove"></button>
20      </div>
21      <div class="panel-body">
22      </div>
23    </div>
24  </template>