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/partials/repo-view.html

@@ -89,6 +89,7 @@
             <h3 class="tab-header">Tag History</h3>
             <div class="repo-tag-history"
                  repository="viewScope.repository"
+                 repository-tags="viewScope.repositoryTags"
                  filter="viewScope.historyFilter"
                  image-loader="viewScope.imageLoader"
                  is-enabled="historyShown"></div>