Update pulsar.filter_data

[blarsen10]

• Fixes a missing underscore, which previously caused planetssb to not update properly
• Allows option to input custom mask if not doing a simple time-slice
• Improves docstring

[codecov]

Codecov Report

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 71.50%. Comparing base (6fa7e04) to head (0d561cd).
Report is 61 commits behind head on dev.

Files with missing lines	Patch %	Lines
enterprise/pulsar.py	16.66%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #409      +/-   ##
==========================================
- Coverage   71.64%   71.50%   -0.15%     
==========================================
  Files          13       13              
  Lines        3231     3246      +15     
==========================================
+ Hits         2315     2321       +6     
- Misses        916      925       +9     

Files with missing lines	Coverage Δ
enterprise/pulsar.py	28.57% <16.66%> (-0.06%)	⬇️

... and 1 file with indirect coverage changes

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