[Flink-21910][resourcemanager] fix the check that whether JobLeaderIdService has been stated

[pengkangjing]

What is the purpose of the change

fix the check that whether JobLeaderIdService has been started. More details you can find in FLINK-21910.

Brief change log

fix the check that whether JobLeaderIdService has been started

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (yes / no)
• The serializers: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): (yes / no / don't know)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (yes / no / don't know)
• The S3 file system connector: (yes / no / don't know)

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

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Automated Checks

Last check on commit cd66720 (Tue Mar 16 06:13:30 UTC 2021)

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CI report:

• 46ae634 Azure: SUCCESS

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[zentol]

Please file a JIRA ticket for this issue. We should also add a test to ensure this issues does not occur again.

[tillrohrmann]

Thanks for creating this PR @pengkangjing. The changes look good to me. Merging this PR now.