update(intersect): refactor "forgrive" parameter to "forgive"

[jlarsen-usgs]

• update forgive return value to None, None for consistency

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 55.5%. Comparing base (ff5624e) to head (0e7f600).
Report is 3 commits behind head on develop.

Files with missing lines	Patch %	Lines
flopy/discretization/modeltime.py	33.3%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2516   +/-   ##
========================================
  Coverage     55.5%    55.5%           
========================================
  Files          644      644           
  Lines       124157   124249   +92     
========================================
+ Hits         68922    68982   +60     
- Misses       55235    55267   +32     

Files with missing lines	Coverage Δ
flopy/discretization/modeltime.py	76.9% <33.3%> (ø)

... and 7 files with indirect coverage changes

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