Fix Browse Menu Padding

[SivanC]

Shift padding from li wrapper to button element to increase clickable area of buttons in header browse menu.

Closes #9971

Fixes an issue where some vertical space on button in the header Browse dropdown menu was unclickable.

Technical

Shifted padding from li wrapper to a inner element in header-bar.less

Testing

• Open the Browse menu on any screen
• Confirm that, for each button, the top and bottom 5px are now clickable (excluding the border)

Screenshot

Image shows the new boundaries of the a clickable element in the browse menu:

Stakeholders

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 17.12%. Comparing base (ce16a79) to head (d446cbc).
Report is 511 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9988      +/-   ##
==========================================
+ Coverage   16.06%   17.12%   +1.06%     
==========================================
  Files          90       89       -1     
  Lines        4769     4752      -17     
  Branches      832      831       -1     
==========================================
+ Hits          766      814      +48     
+ Misses       3480     3428      -52     
+ Partials      523      510      -13     

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