Fixes failing tests on electron 5

[darangi]

Fixes

atom/atom#20411

Description of the Change

This fix failing tests when the GitHub package tests are executed against electron 5. These failing tests make the CI exit without proper errors.

[codecov]

Codecov Report

Merging #2413 into master will decrease coverage by 0.14%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2413      +/-   ##
==========================================
- Coverage   93.52%   93.38%   -0.15%     
==========================================
  Files         235      235              
  Lines       13147    13147              
  Branches     1885     1885              
==========================================
- Hits        12296    12277      -19     
- Misses        851      870      +19

Impacted Files	Coverage Δ
lib/worker-manager.js	90.79% <100%> (ø)	⬆️
lib/models/branch.js	84.21% <0%> (-14.74%)	⬇️
lib/git-temp-dir.js	96.77% <0%> (-3.23%)	⬇️
lib/git-prompt-server.js	97.29% <0%> (-2.71%)	⬇️
lib/helpers.js	89.3% <0%> (-1.24%)	⬇️

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