Fix setting a new owner from UI

Change-Id: I7536f1812869623519edb702392b9a24ca4c4a23
diff --git a/src/main/resources/static/gr-serviceuser-detail.js b/src/main/resources/static/gr-serviceuser-detail.js
index ed9a77a..c2ea3e5 100644
--- a/src/main/resources/static/gr-serviceuser-detail.js
+++ b/src/main/resources/static/gr-serviceuser-detail.js
@@ -312,7 +312,7 @@
           .put(`${this._serviceUser._account_id}/owner`, {group: owner})
           .then(() => {
             this.$.serviceUserOwnerInput.text = this._getOwnerGroup(
-                _serviceUser);
+                this._serviceUser);
           });
     },