Unskip 'bitwarden installs when enabled' automated test

[luixxiul]

Closes #11357
Follow-up to #4776

It should not be skipped since 0.19 as the extension is re-enabled on that version.

Auditors: @bsclifton

Test Plan:

1. Run npm run test -- --grep='bitwarden installs when enabled'

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.

Test Plan:

Reviewer Checklist:

Tests

• Adequate test coverage exists to prevent regressions
• Tests should be independent and work correctly when run individually or as a suite ref
• New files have MPL2 license header

[codecov-io]

Codecov Report

Merging #11358 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #11358      +/-   ##
==========================================
- Coverage   52.51%   52.48%   -0.04%     
==========================================
  Files         267      267              
  Lines       24982    24982              
  Branches     3997     3997              
==========================================
- Hits        13120    13111       -9     
- Misses      11862    11871       +9

Flag	Coverage Δ
#unittest	52.48% <ø> (-0.04%)	⬇️

Impacted Files	Coverage Δ
js/stores/appStoreRenderer.js	91.17% <0%> (-8.83%)	⬇️
app/renderer/components/reduxComponent.js	84.37% <0%> (-6.25%)	⬇️
js/stores/windowStore.js	27.27% <0%> (-0.31%)	⬇️

[luixxiul]

https://travis-ci.org/brave/browser-laptop/jobs/284921496#L3362

    bitwarden installs when enabled
      ✓ installs (1594ms)

[cezaraugusto]

++

[cezaraugusto]

master d39d84b
0.20.x eb350b7
0.19.x 4233328