Remove ensemble generation from DB Object tests

[al-rigazzi]

This PR is a quick bugfix. In the DB Object tests (bot DB scripts and DB models), we are currently calling exp.generate for some ensembles, but that is not needed, as they are automatically generated in the exp path.

While this PR fixes the test output path issue, there remains an issue with the generation of ensembles: the path should be honored. I will put up a different ticket for that issue.

[codecov]

Codecov Report

Merging #349 (d350dd0) into develop (c4bf40c) will decrease coverage by 0.33%.
Report is 4 commits behind head on develop.
The diff coverage is n/a.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #349      +/-   ##
===========================================
- Coverage    87.36%   87.04%   -0.33%     
===========================================
  Files           59       59              
  Lines         3546     3551       +5     
===========================================
- Hits          3098     3091       -7     
- Misses         448      460      +12     

see 5 files with indirect coverage changes

[MattToast]

LGTM!! Thanks for chasing this down, this alone is going to make testing locally MUCH easier!!