Let wpt-pr-bot assign reviewers for wasm workflow (#58554)

* Change PR reviewer to wpt-pr-bot for wasm workflow

* Remove reviewer from PR creation in workflow

Removed the reviewer parameter from the PR creation command.

Author: jcscottiii

.github/workflows/update-wasm-tests.yml

@@ -56,7 +56,7 @@ jobs:
         run: |
           cd wpt
           git push --set-upstream origin $BRANCH_NAME
-          gh pr create --title "$COMMIT_TITLE" --body "$PR_BODY" --reviewer jcscottiii,dschuff
+          gh pr create --title "$COMMIT_TITLE" --body "$PR_BODY"
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           COMMIT_TITLE: "Update Wasm tests"