properly ignore files for coverage

[lawrence-mbf]

Motivation

Some files are erroneously being checked for coverage due to a bug in the nwbtest.m script. This PR fixes the script and adds the +test module to the ignoreFolders argument.

How to test the behavior?

the coverage should ignore +tests directory and +misc/generateDocs.m

Checklist

• Have you ensured the PR description clearly describes the problem and solutions?
• Have you checked to ensure that there aren't other open or previously closed Pull Requests for the same change?
• If this PR fixes an issue, is the first line of the PR description fix #XX where XX is the issue number?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3267d8d) 87.96% compared to head (d21ddea) 87.11%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #553      +/-   ##
==========================================
- Coverage   87.96%   87.11%   -0.86%     
==========================================
  Files         133      104      -29     
  Lines        5677     4617    -1060     
==========================================
- Hits         4994     4022     -972     
+ Misses        683      595      -88     

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