Fix capability check in UI

Change-Id: I665beae2cf871e871275e15c5451b26e70b19950

gr-serviceuser/gr-serviceuser-detail.js

diff --git a/gr-serviceuser/gr-serviceuser-detail.js b/gr-serviceuser/gr-serviceuser-detail.js
index fa8fd32..c757b0c 100644
--- a/gr-serviceuser/gr-serviceuser-detail.js
+++ b/gr-serviceuser/gr-serviceuser-detail.js
@@ -135,7 +135,7 @@
   }
 
   _getPermissions() {
-    return this.plugin.restApi().getAccountCapabilities(['administrateServer'])
+    return this.plugin.restApi('/accounts/self/capabilities/').get('')
         .then(capabilities => {
           this._isAdmin = capabilities && capabilities.administrateServer;
         });

gr-serviceuser/gr-serviceuser.js

diff --git a/gr-serviceuser/gr-serviceuser.js b/gr-serviceuser/gr-serviceuser.js
index c6624a6..81b7329 100644
--- a/gr-serviceuser/gr-serviceuser.js
+++ b/gr-serviceuser/gr-serviceuser.js
@@ -20,10 +20,7 @@
 import {GrServiceUserCreate} from './gr-serviceuser-create.js';
 
 Gerrit.install(plugin => {
-  plugin.restApi()
-      .getAccountCapabilities([
-        'administrateServer',
-        'serviceuser-createServiceUser'])
+  plugin.restApi('/accounts/self/capabilities/').get('')
       .then(capabilities => {
         if (capabilities
             && (capabilities.administrateServer