[FLINK-15726] [Blink Planner] [hotfix] Fix error message in StreamExecTableSourceScan

[benoitparis]

Applying the Blink version of:
02b676e#diff-ed386bd5b2f8bc873a24413ff1d82562

What is the purpose of the change

Correcting an error message.

Brief change log

• Fixing a String

Verifying this change

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

This change added tests and can be verified as follows:

N/A

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• Dependencies (does it add or upgrade a dependency): (yes / no)
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• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, 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)

[benoitparis]

Oops, copied from the wrong version, the inputDataType variable does not exists. Fixing it

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Last check on commit 2ea76a0 (Tue Jan 21 11:18:34 UTC 2020)

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[dawidwys]

Hi @benoitparis thank you for your contribution.

Could you also fix it in BatchExecTableSourceScan?

[benoitparis]

@dawidwys done!