Correct argument names in planartrace function

[lkdvos]

Update argument names in the planartrace function according to report in #227

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.63%. Comparing base (2a66d10) to head (b60fd69).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/planar/planaroperations.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #229   +/-   ##
=======================================
  Coverage   82.63%   82.63%           
=======================================
  Files          43       43           
  Lines        5557     5557           
=======================================
  Hits         4592     4592           
  Misses        965      965           

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