Fix flaky test: test_stack on test_faker_computer.rb

[thdaraujo]

It looks like the test below is flaky, and there is a comment on line 20 that needs to be removed:

faker/test/faker/default/test_faker_computer.rb

Line 19 in 9093f59

def test_stack

It raises the error below when Faker::Computer.stack[:platform] is equal to plan 9.

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Error: test_stack(TestFakerComputer): I18n::MissingTranslationData: translation missing: en.faker.computer.os.plan 9
/opt/hostedtoolcache/Ruby/2.5.9/x64/lib/ruby/gems/2.5.0/gems/i18n-1.12.0/lib/i18n.rb:394:in `handle_exception'
/opt/hostedtoolcache/Ruby/2.5.9/x64/lib/ruby/gems/2.5.0/gems/i18n-1.12.0/lib/i18n.rb:367:in `translate_key'
/opt/hostedtoolcache/Ruby/2.5.9/x64/lib/ruby/gems/2.5.0/gems/i18n-1.12.0/lib/i18n.rb:222:in `translate'
/home/runner/work/faker/faker/lib/faker.rb:167:in `block in translate'
/home/runner/work/faker/faker/lib/faker.rb:259:in `disable_enforce_available_locales'
/home/runner/work/faker/faker/lib/faker.rb:166:in `rescue in translate'
/home/runner/work/faker/faker/lib/faker.rb:156:in `translate'
/home/runner/work/faker/faker/lib/faker.rb:103:in `fetch'
/home/runner/work/faker/faker/lib/faker/default/computer.rb:58:in `stack'
/home/runner/work/faker/faker/test/faker/default/test_faker_computer.rb:22:in `test_stack'
     19:   def test_stack
     20:     # puts @tester.stack
     21:     assert stack = @tester.stack
  => 22:                           .match(/\A(?<platform>(?:[[:alnum:]]+\s?){1,5}), (?<os>(?:[[:alnum:]]+-?.?\)?\(?\s?){1,5})\z/)
     23: 
     24:     platform = stack[:platform]
     25:     search_format_platform = platform.downcase
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