Fix JSONResponse default content type

[prryplatypus]

Fixes #2736

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (6eaab2a) 88.938% compared to head (93e86b8) 88.938%.

❗ Current head 93e86b8 differs from pull request most recent head 32bd976. Consider uploading reports for the commit 32bd976 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #2737   +/-   ##
=========================================
  Coverage   88.938%   88.938%           
=========================================
  Files           92        92           
  Lines         6952      6952           
  Branches      1185      1185           
=========================================
  Hits          6183      6183           
  Misses         527       527           
  Partials       242       242           

Impacted Files	Coverage Δ
sanic/response/types.py	84.831% <ø> (ø)

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