fix(cli): correct bad plan ID format

[olevski]

closes #3592

[coveralls]

Pull Request Test Coverage Report for Build 5900666129

• 28 of 34 (82.35%) changed or added relevant lines in 3 files are covered.
• 36 unchanged lines in 11 files lost coverage.
• Overall coverage decreased (-0.1%) to 85.694%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
renku/command/checks/workflow.py	17	20	85.0%
renku/ui/service/serializers/workflows.py	10	13	76.92%

Files with Coverage Reduction	New Missed Lines	%
renku/core/dataset/providers/dataverse.py	1	64.76%
renku/core/migration/m_0003__1_jsonld.py	1	87.68%
renku/infrastructure/repository.py	1	81.57%
renku/ui/cli/init.py	1	96.9%
renku/ui/service/cache/models/file.py	1	93.15%
renku/command/rollback.py	2	78.7%
renku/ui/service/jobs/cleanup.py	2	80.65%
renku/core/dataset/context.py	3	91.43%
renku/core/util/git.py	4	84.68%
renku/ui/service/gateways/repository_cache.py	7	58.54%

Totals
Change from base Build 5865855273:	-0.1%
Covered Lines:	25842
Relevant Lines:	30156

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💛 - Coveralls