Action item style: add pressed state

[vanesa]

The Sourcegraph git extras extension currently does not have a pressed state making it difficult to determine if the extension is activated or not.

This PR adds pressed to the action item.

[codecov-io]

Codecov Report

Merging #68 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master     #68   +/-   ##
======================================
  Coverage    39.5%   39.5%           
======================================
  Files           4       4           
  Lines          81      81           
  Branches       13      13           
======================================
  Hits           32      32           
  Misses         49      49

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.50%. Comparing base (5a03c89) to head (4359cbf).
⚠️ Report is 262 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #68      +/-   ##
==========================================
- Coverage   42.69%   39.50%   -3.20%     
==========================================
  Files           4        4              
  Lines          89       81       -8     
  Branches       18       13       -5     
==========================================
- Hits           38       32       -6     
+ Misses         51       49       -2     

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