Ignore . prefixed directory when searching managed Python for pygrep

[j178]

For #918

[codecov]

Codecov Report

❌ Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.06%. Comparing base (d174e59) to head (0a0f4ad).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/languages/pygrep/pygrep.rs	16.66%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #919      +/-   ##
==========================================
- Coverage   90.10%   90.06%   -0.04%     
==========================================
  Files          64       64              
  Lines       11944    11950       +6     
==========================================
+ Hits        10762    10763       +1     
- Misses       1182     1187       +5     

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