Sort labels in change-view similar to reply dialog

Change-Id: I90e9186673a37f80cad0e84ef36942cd88d93e25
diff --git a/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.ts b/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.ts
index 7a99086..cdac00a 100644
--- a/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-requirements/gr-change-requirements.ts
@@ -130,7 +130,7 @@
     this._optionalLabels = [];
     this._requiredLabels = [];
 
-    for (const label in labels) {
+    for (const label of Object.keys(labels || {}).sort()) {
       if (!hasOwnProperty(labels, label)) {
         continue;
       }