Change b to wp for consistency

[baggepinnen]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.05%. Comparing base (b347dcd) to head (529c1ea).

Files with missing lines	Patch %	Lines
src/DiscretePIDs.jl	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #18      +/-   ##
==========================================
- Coverage   98.63%   96.05%   -2.58%     
==========================================
  Files           1        1              
  Lines          73       76       +3     
==========================================
+ Hits           72       73       +1     
- Misses          1        3       +2     

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