chore(mergify): remove commented-reviews-by condition (aws-samples#310)

This condition enforces that PRs have no comments before it can be
merged. It's not clear why this is needed. As long as the build succeeds
and there is one approval from a core member, it's fine to merge

.mergify.yml

@@ -19,7 +19,6 @@ pull_request_rules:
       - "#approved-reviews-by>=1"
       - -approved-reviews-by~=author
       - "#changes-requested-reviews-by=0"
-      - "#commented-reviews-by=0"
       - status-success=build
       - status-success=Semantic Pull Request
   - name: remove stale reviews