Return 0/1 explicitly as the client expects it

[perlpunk]

t/ui/10-tests_overview.t was failing under perl 5.40:

# Subtest: job dependencies displayed on 'Test result overview' page
    ok 1 - job href is shown correctly
    not ok 2 - dependency is shown correctly

    #   Failed test 'dependency is shown correctly'
    #   at t/ui/10-tests_overview.t line 594.
    #          got: '1 parallel parent
    # dependency failed'
    #     expected: '1 parallel parent
    # dependency passed'

In newer perl versions booleans are preserved, and when Mojolicious sends JSON to the client, it will return it as true. To support both older and newer versions, we explicitly return 0 or 1.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.98%. Comparing base (b96e97b) to head (bc927f2).
Report is 7 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6034   +/-   ##
=======================================
  Coverage   98.98%   98.98%           
=======================================
  Files         395      395           
  Lines       39358    39358           
=======================================
  Hits        38958    38958           
  Misses        400      400           

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