Remove BASH_SOURCE from setupdb.sh

[gdetrez]

Should fix the system tests.

[codecov-io]

Codecov Report

Merging #406 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #406      +/-   ##
==========================================
+ Coverage   41.49%   41.52%   +0.02%     
==========================================
  Files         215      215              
  Lines       17085    17085              
  Branches     2954     2954              
==========================================
+ Hits         7089     7094       +5     
+ Misses       9578     9576       -2     
+ Partials      418      415       -3

Impacted Files	Coverage Δ
scanomatic/data_processing/phases/segmentation.py	74.65% <0%> (+1.39%)	⬆️

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