fix changedFilesWithAncestor

[aaronabramov]

adding anything to defaults.js makes it not overwritable :'(

won't write a test cause it's a super edge case

[codecov-io]

Codecov Report

Merging #4193 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4193   +/-   ##
=======================================
  Coverage   60.25%   60.25%           
=======================================
  Files         198      198           
  Lines        6781     6781           
  Branches        6        6           
=======================================
  Hits         4086     4086           
  Misses       2692     2692           
  Partials        3        3

Impacted Files	Coverage Δ
packages/jest-config/src/defaults.js	85.71% <ø> (ø)	⬆️

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[cpojer]

I would say that if it's a super edge-case, writing a test for it is super important ;)

[github-actions]

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