Fix the quick-submit for pending review comment (#20992)

If there is only one "Add comment" button (when there are pending review comments), the quick-submit should submit the form with is_review=true even if the "Add comment" button is not really clicked.

Close  #20990

templates/repo/diff/comment_form.tmpl

@@ -29,6 +29,8 @@
 					<input type="hidden" name="reply" value="{{$.reply}}">
 				{{else}}
 					{{if $.root.CurrentReview}}
+						{{/* if there is only one "Add comment" button, the quick-submit should submit the form with is_review=true even if the "Add comment" button is not really clicked */}}
+						<input type="hidden" name="is_review" value="true">
 						<button name="is_review" value="true" type="submit"
 								class="ui submit green tiny button btn-add-comment">{{$.root.locale.Tr "repo.diff.comment.add_review_comment"}}</button>
 					{{else}}