Add `await`

Fixes the Google internal build.

Release-Notes: skip
Change-Id: Iadaa3c4ec4070abe92cf45ab65014026ef4cb445

polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts

diff --git a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
index a4b4f13..863f4f8 100644
--- a/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
+++ b/polygerrit-ui/app/elements/shared/gr-comment/gr-comment.ts
@@ -1276,7 +1276,7 @@
     }
     this.generatedFixSuggestion = suggestion;
     try {
-      waitUntil(() => this.getFixSuggestions() !== undefined);
+      await waitUntil(() => this.getFixSuggestions() !== undefined);
       this.autoSaveTrigger$.next();
     } catch (error) {
       // Error is ok in some cases like quick save by user.