Fix intersection commutativity 1086

[johnynek]

close #1086

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (16045fc) 92.30% compared to head (006eaa2) 92.30%.

Files	Patch %	Lines
...in/scala/org/bykn/bosatsu/pattern/SeqPattern.scala	91.30%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1088      +/-   ##
==========================================
- Coverage   92.30%   92.30%   -0.01%     
==========================================
  Files          93       93              
  Lines       10564    10589      +25     
  Branches     2497     2517      +20     
==========================================
+ Hits         9751     9774      +23     
- Misses        813      815       +2     

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