rollback check_properties.yml (#2551)

# Description

Please provide a summary of the changes, including relevant motivation
and context.

Closes #(issue_number)

## Checklist

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] I have performed a self-review of my own code
- [ ] I have attached images of the change if it is UI based
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] If my code has heavily changed functionality I have updated
relevant docs on [Stirling-PDFs doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
- [ ] My changes generate no new warnings
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

.github/workflows/check_properties.yml

@@ -27,11 +27,9 @@ jobs:
 
       - name: Checkout PR branch
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-        env:
-          PULL_REQUEST_REF: ${{ github.event.pull_request.head.ref }}
         with:
           repository: ${{ github.event.pull_request.head.repo.full_name }}
-          ref: $PULL_REQUEST_REF
+          ref: ${{ github.event.pull_request.head.ref }}
           path: pr-branch
           fetch-depth: 0