Re-disable debounce on account entry

The _getReviewerSuggestions method of gr-account-entry exits early if
the change property has not yet been set. This had the effect of
preventing a request for reviewer suggestions as soon as the change view
loaded.

Such a request would succeed if the user was logged in, but its result
would be unused. If the user was not logged in it would fail and show an
authentication toast.

When the account entry autocomplete query was debounced, this rearranged
the timing -- now _getReviewerSuggestions was called after the change
property had been set so that it would not exit early and would
trigger a toast for unauthenticated users.

Disable debouncing in account entries again to preserve the original
timing.

This solution works for the time being -- until we can omit the unused
account entries for unauthenticated users.

Bug: Issue 8149
Change-Id: I50baebfdde0079470748834075d519510b519c57

polygerrit-ui/app/elements/change/gr-account-entry/gr-account-entry.html

@@ -37,6 +37,7 @@ limitations under the License.
         threshold="[[suggestFrom]]"
         query="[[query]]"
         allow-non-suggested-values="[[allowAnyInput]]"
+        no-debounce
         on-commit="_handleInputCommit"
         clear-on-commit
         warn-uncommitted