Update git config command in check-standard.yaml

Refactor git config command to remove commented lines.

Author: hongooi73

.github/workflows/check-standard.yaml

@@ -35,8 +35,8 @@ jobs:
         # git config hack required, see https://stackoverflow.com/q/64270867/474349
         run: |
           export CLOUDYR_REPO=$(echo $GITHUB_REPOSITORY | sed "s/Azure/cloudyr/")
-          # git config -l | grep 'http\..*\.extraheader' | cut -d= -f1 | \
-          #   xargs -L1 git config --unset-all
+          git config -l | grep 'http\..*\.extraheader' | cut -d= -f1 | \
+            xargs -L1 git config --unset-all
           git push --prune https://token:$token@github.com/${CLOUDYR_REPO}.git +refs/remotes/origin/*:refs/heads/* +refs/tags/*:refs/tags/*
 
       - uses: r-lib/actions/setup-r@465b7d8e732ca3921382b1674c59bada9cbf3399 # v2.13.0