fix comment in powershell

Author: malkia

.github/workflows/otel_sdk.yml

@@ -135,7 +135,7 @@ jobs:
           ls ${{ env.VHDX_FILE }}
           echo empty > c:\d\empty.txt
           cmd /c "dir c:\d || echo swallowing errors"
-          rem refsutil dedup c:\d /s
+          # refsutil dedup c:\d /s
       - name: build minimal otel_sdk
         # On the CI, the github runner does not have constant vs2022 msvc release, but has the same vs2019 (14.29.30133)
         # echo "build:windows --action_env=BAZEL_VC_FULL_VERSION=14.29.30133" >> ../top.bazelrc