Fix firefox example in awful.permissions

[SethBarberee]

Was trying out the example and it didn't work until I removed the context string.

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 54.20%. Comparing base (e080bf2) to head (63bbe80).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2966      +/-   ##
==========================================
- Coverage   54.43%   54.20%   -0.23%     
==========================================
  Files         263      261       -2     
  Lines       31238    31173      -65     
  Branches     1143     1143              
==========================================
- Hits        17004    16897     -107     
- Misses      13724    13766      +42     
  Partials      510      510              

Files with missing lines	Coverage Δ
lib/awful/permissions/init.lua	48.83% <ø> (ø)

... and 9 files with indirect coverage changes

:rocket: New features to boost your workflow:

• :snowflake: Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[SethBarberee]

Would like to figure out another example that can show the purpose of the context part but need more time to mess around with this API.

[Aire-One]

@mergifyio rebase

[mergify[bot]]

rebase

✅ Branch has been successfully rebased