fix: do not change the revisionCounterDisabled as it is an immutable field after creation (backport #3085)

[mergify]

Which issue(s) this PR fixes:

Issue # longhorn/longhorn#9279

What this PR does / why we need it:

Refer to longhorn/longhorn#9279 (comment)

---

This is an automatic backport of pull request #3085 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 2328a53 has failed:

On branch mergify/bp/v1.6.x/pr-3085
Your branch is ahead of 'origin/v1.6.x' by 1 commit.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit 2328a530.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   webhook/resources/volume/mutator.go

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[derekbit]

cc @PhanLe1010