Removes the `--no-use-pep517` flag on the Mac build. Prematurely added.

azure-pipelines.yml

@@ -86,7 +86,7 @@ phases:
     name: Hosted macOS
   steps:
   - script: |
-       pip3 install --no-use-pep517 -r src/requirements.txt
+       pip3 install -r src/requirements.txt
     displayName: install requirements
   - script: |
        python3 -m pylint src