pre-commit.yml: remove duplicate --color=always argument

The prek-action already passes --color=always internally,
so passing it again via extra-args causes a CLI error.

Co-authored-by: Claude <noreply@anthropic.com>

.github/workflows/pre-commit.yml

@@ -15,6 +15,6 @@ jobs:
         uses: actions/checkout@v6
       - uses: j178/prek-action@v1
         with:
-          extra-args: --color=always --all-files
+          extra-args: --all-files
       - name: Run manual pre-commit hooks
         run: prek run --color=always --all-files --hook-stage manual