Remove now unused parameter

[mborland]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.06%. Comparing base (06d11fb) to head (d5bab81).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1177      +/-   ##
===========================================
  Coverage    94.05%   94.06%              
===========================================
  Files          572      780     +208     
  Lines        51332    65796   +14464     
===========================================
+ Hits         48282    61891   +13609     
- Misses        3050     3905     +855     

Files	Coverage Δ
include/boost/math/special_functions/erf.hpp	99.10% <100.00%> (+2.33%)	⬆️

... and 237 files with indirect coverage changes

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