Fix JSONResponse default content type

[prryplatypus]

Fixes #2736 on LTS

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.060 ⚠️

Comparison is base (4ad8168) 88.650% compared to head (6b9c1cc) 88.591%.

❗ Current head 6b9c1cc differs from pull request most recent head 6d08353. Consider uploading reports for the commit 6d08353 to get more accurate results

Additional details and impacted files

@@              Coverage Diff               @@
##           22.12LTS     #2738       +/-   ##
==============================================
- Coverage    88.650%   88.591%   -0.060%     
==============================================
  Files            82        82               
  Lines          6767      6767               
  Branches       1156      1156               
==============================================
- Hits           5999      5995        -4     
- Misses          531       533        +2     
- Partials        237       239        +2     

Impacted Files	Coverage Δ
sanic/response/types.py	84.705% <ø> (ø)

... and 1 file with indirect coverage changes

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[prryplatypus]

Linter errors seem unrelated

[ahopkins]

Can we get the linter issue fixed?

[prryplatypus]

Can we get the linter issue fixed?

Done. Apparently just had to run black :)