pd: Fix the default name of the configuration

[HuSharp]

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What is the related PR or file link(s)?

ref https://github.com/tikv/pd/blob/10cbdcf0c551c3e337ebc1b885b1f2ccd874b163/server/config/config.go#L364-L370

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[LGTM Timeline notifier]

Timeline:

• 2024-08-21 09:13:31.892791458 +0000 UTC m=+343207.027241581: ☑️ agreed by qiancai.

[qiancai]

/approve

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #18410.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.0: #18411.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.4: #18412.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #18413.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #18415.