Update configuration slightly

.github/workflows/new_pull_request.yml

@@ -1,9 +1,10 @@
 # This workflow runs whenever a new pull request is created
-name: New Pull Request
+name: Pull Request opened
 
-# Only run for "main" branch PRs
+# Only run for newly opened PRs against the "main" branch
 on: 
   pull_request:
+    types: [opened]
     branches: 
       - main
 
@@ -15,7 +16,6 @@ jobs:
     # See https://github.com/marketplace/actions/pull-request-assigner
     - name: Assign PR to creator
       uses: thomaseizinger/assign-pr-creator-action@v1.0.0
-      if: github.event_name == 'pull_request' && github.event.action == 'opened'
       # Note, this authentication token is created automatically
       # See: https://docs.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token
       with: