Reuse Gitlab::Geo.current_node on GeoBackfillWorker

[ci skip]

app/workers/geo_backfill_worker.rb

@@ -60,12 +60,6 @@ class GeoBackfillWorker
     # No caching of the enabled! If we cache it and an admin disables
     # this node, an active GeoBackfillWorker would keep going for up
     # to max run time after the node was disabled.
-    current_node.enabled?
-  end
-
-  def current_node
-    GeoNode.find_by(host: Gitlab.config.gitlab.host,
-                    port: Gitlab.config.gitlab.port,
-                    relative_url_root: Gitlab.config.gitlab.relative_url_root)
+    Gitlab::Geo.current_node.enabled?
   end
 end