Remove incorrectly tagged boolean dimension

[jsoriano]

Boolean fields cannot be dimensions. In this case the rest of fields
marked as dimensions for this datastream should be enough.

It wasn't detected earlier because dimensions validation was not
properly working till elastic/package-spec#279.

What does this PR do?

Removes incorrectly tagged boolean dimension.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Related issues

• Found while updating the spec in Bump github.com/elastic/elastic-package from 0.38.0 to 0.39.0 #2825.

[elasticmachine]

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• Start Time: 2022-03-15T16:04:56.976+0000

• Duration: 29 min 24 sec

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