scale-a-tidb-cluster: fix pd micro service indent

[HuSharp]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-25 08:05:24.685521266 +0000 UTC m=+1882351.707767640: ☑️ agreed by qiancai.

[qiancai]

/cherry-pick release-1.6

[ti-chi-bot]

@qiancai: once the present PR merges, I will cherry-pick it on top of release-1.6 in the new PR and assign it to you.

In response to this:

/cherry-pick release-1.6

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[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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[ti-chi-bot]

@qiancai: new pull request created to branch release-1.6: #2528.

In response to this:

/cherry-pick release-1.6

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.