Fix accept header handling

[vigoo]

Handles / and x/* accept headers

[codecov-commenter]

Codecov Report

Patch coverage: 27.27% and project coverage change: +0.32% 🎉

Comparison is base (020f6f9) 63.01% compared to head (77481c5) 63.34%.
Report is 1 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2391      +/-   ##
==========================================
+ Coverage   63.01%   63.34%   +0.32%     
==========================================
  Files         137      137              
  Lines        7101     7109       +8     
  Branches     1257     1267      +10     
==========================================
+ Hits         4475     4503      +28     
+ Misses       2626     2606      -20     

Files Changed	Coverage Δ
...scala/zio/http/codec/internal/MediaTypeCodec.scala	29.23% <27.27%> (-2.35%)	⬇️

... and 6 files with indirect coverage changes

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