Fix tag reversion UI (#3295)

* Remove unused check

The tags returned from the tag history endpoint did not have
an image_id field until https://github.com/quay/quay/pull/3238 (tags pagination), so the
condition was never met. After #3238, the tags returned from the tag
history endpoints have an image_id field, which is equal to its
docker_image_id field, to allow the same behavior from consumers
getting tags from the repository endpoint (e.g repo-view).

* watch repositoryTags instead of repository in repo-tag-history

static/directives/repo-tag-history.html

@@ -111,7 +111,7 @@
      </table>
    </div>
 
-  <div class="tag-operations-dialog" repository="repository"
+  <div class="tag-operations-dialog" repository="repository" repository-tags="repositoryTags"
      image-loader="imageLoader"
      action-handler="tagActionHandler"></div>