Add shortcut for toggling the bookmark toolbar

[jbyte]

Resolves #12594

Auditors:

Test Plan:

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.
• Request a security/privacy review as needed. (Ask a Brave employee to help if you cannot access this document.)

Test Plan:

Reviewer Checklist:

• Request a security/privacy review as needed if one was not already requested.

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 #12625 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12625      +/-   ##
==========================================
- Coverage   56.24%    56.2%   -0.04%     
==========================================
  Files         278      278              
  Lines       27115    27115              
  Branches     4392     4392              
==========================================
- Hits        15250    15241       -9     
- Misses      11865    11874       +9

Flag	Coverage Δ
#unittest	56.2% <ø> (-0.04%)	⬇️

Impacted Files	Coverage Δ
app/common/commonMenu.js	52.2% <ø> (ø)	⬆️
js/stores/appStoreRenderer.js	91.17% <0%> (-8.83%)	⬇️
app/renderer/components/reduxComponent.js	84.37% <0%> (-6.25%)	⬇️
js/stores/windowStore.js	27.25% <0%> (-0.31%)	⬇️

[bsclifton]

Works perfectly! Super nice addition 😄 👍

[bsclifton]

@jonathansampson would you be able to give this a go on Windows?

[jonathansampson]

@bsclifton Checking it out now!

[jonathansampson]

Nicely done! Works as expected!