Lookup correct remote for current branch

[dominikschulz]

Fixes #691

[codecov]

Codecov Report

Merging #692 into master will decrease coverage by 0.29%.
The diff coverage is 4.76%.

@@            Coverage Diff             @@
##           master     #692      +/-   ##
==========================================
- Coverage   65.14%   64.85%   -0.29%     
==========================================
  Files         144      144              
  Lines        8218     8255      +37     
==========================================
  Hits         5353     5353              
- Misses       2217     2254      +37     
  Partials      648      648

Impacted Files	Coverage Δ
backend/sync/git/cli/git.go	63.91% <0%> (-7.15%)	⬇️
backend/sync/git/cli/config.go	31.03% <9.09%> (-16.33%)	⬇️

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