Remove failing SSH key check

[m3nu]

Fixes #886

[codecov-io]

Codecov Report

Merging #887 (7ce4ec2) into master (3c0dd72) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #887      +/-   ##
==========================================
+ Coverage   70.35%   70.38%   +0.02%     
==========================================
  Files          56       56              
  Lines        3791     3788       -3     
==========================================
- Hits         2667     2666       -1     
+ Misses       1124     1122       -2     

Impacted Files	Coverage Δ
src/vorta/borg/borg_thread.py	76.79% <ø> (+0.70%)	⬆️

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[m3nu]

Reverting a few lines from your PR, @samuel-w . Have to admit that the code is confusing and the bug rare. Sorry for that. :-(

[samuel-w]

Actually it could have been solved by modifiying the fakerepo. No big deal, lets fix it when someone files a bug report.