Adjust branch button size

[silverwind]

Adjusted the branch button size to more closely match the other buttons beside it. It's still 1px higher than the compare button, but I'm not even sure that that can be solved using semantic classes only.

Before

After

[codecov-io]

Codecov Report

Merging #3063 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3063      +/-   ##
==========================================
+ Coverage   33.43%   33.45%   +0.01%     
==========================================
  Files         270      270              
  Lines       39553    39553              
==========================================
+ Hits        13226    13232       +6     
+ Misses      24441    24429      -12     
- Partials     1886     1892       +6

Impacted Files	Coverage Δ
models/repo.go	37.96% <0%> (-0.19%)	⬇️
modules/indexer/repo.go	63.47% <0%> (+2.6%)	⬆️
models/repo_indexer.go	51.98% <0%> (+2.97%)	⬆️

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[lafriks]

LGTM

[ethantkoenig]

LGTM