Fix: remove invalid review_triggered_on input

The action auto-detects review mode from the pull_request trigger.
Only use_sticky_comment and prompt are needed.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: justin808

.github/workflows/claude-code-review.yml

@@ -24,5 +24,6 @@ jobs:
         uses: anthropics/claude-code-action@v1
         with:
           claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
-          review_triggered_on: pr
           use_sticky_comment: true
+          prompt: |
+            Review this PR for correctness, security issues, and potential improvements.