tools/cli: reducing unnecessary closures

[Groxx]

Pretty simple change: these closures don't actually buy us anything, but they do make coverage more annoying to gather because we don't call the closure.
So just get rid of the closures. Shorter and free coverage.

[Groxx]

Difftastic makes this quite easy to check by hand:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.97%. Comparing base (84ab621) to head (87142e1).

Additional details and impacted files

Files	Coverage Δ
tools/cli/admin.go	98.35% <100.00%> (+31.49%)	⬆️
tools/cli/cluster.go	100.00% <100.00%> (ø)
tools/cli/task_list.go	100.00% <100.00%> (+13.63%)	⬆️
tools/cli/workflow.go	100.00% <100.00%> (+32.06%)	⬆️

... and 7 files with indirect coverage changes

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[coveralls]

Pull Request Test Coverage Report for Build 018fe06f-9837-4a7b-a8fa-d60958d36128

Details

• 112 of 112 (100.0%) changed or added relevant lines in 4 files are covered.
• 88 unchanged lines in 17 files lost coverage.
• Overall coverage increased (+0.3%) to 70.075%

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Files with Coverage Reduction	New Missed Lines	%
service/matching/tasklist/db.go	2	73.23%
common/peerprovider/ringpopprovider/config.go	2	81.58%
common/task/fifo_task_scheduler.go	2	87.63%
common/persistence/sql/sqlplugin/mysql/task.go	2	73.68%
service/history/task/transfer_active_task_executor.go	2	72.79%
common/persistence/sql/sqlplugin/mysql/db.go	2	79.49%
common/log/tag/tags.go	3	50.46%
service/history/handler/handler.go	3	96.2%
common/persistence/statsComputer.go	3	98.21%
service/frontend/api/handler.go	4	62.5%

Totals
Change from base Build 018fe051-df14-4702-b515-0388c6db07f3:	0.3%
Covered Lines:	104369
Relevant Lines:	148939

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💛 - Coveralls