chore: remove unnecessary .prettierignore

[ikatyang]

Summary

package.json is now formatted just like JSON.stringify, see Prettier 1.13 Blog.

Test plan

Mess up package.json and save with formatOnSave enabled?

[codecov-io]

Codecov Report

Merging #6540 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #6540   +/-   ##
=======================================
  Coverage   63.83%   63.83%           
=======================================
  Files         234      234           
  Lines        8797     8797           
  Branches        3        3           
=======================================
  Hits         5616     5616           
  Misses       3180     3180           
  Partials        1        1

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[thymikee]

👍

[github-actions]

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