Fix bash variable naming

[CasperWA]

Fixes #291

[codecov]

Codecov Report

Merging #292 (39ef953) into develop (8aca852) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #292   +/-   ##
========================================
  Coverage    92.93%   92.93%           
========================================
  Files           32       32           
  Lines         1373     1373           
========================================
  Hits          1276     1276           
  Misses          97       97           

Flag	Coverage Δ
aiida	89.36% <ø> (ø)
mongo	79.16% <ø> (ø)

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