Fix updateSnapshot resetting after updating snapshots in watch mode

[chrisbujok]

Fixes #4869

I'm not sure if current behavior was intended, but this fix works for me.
Also I wonder if it'd be enough to always reset to new instead of none, since it runs in the watch mode?

[codecov-io]

Codecov Report

Merging #5256 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #5256      +/-   ##
==========================================
+ Coverage   61.14%   61.14%   +<.01%     
==========================================
  Files         203      203              
  Lines        6843     6844       +1     
  Branches        3        4       +1     
==========================================
+ Hits         4184     4185       +1     
  Misses       2658     2658              
  Partials        1        1

Impacted Files	Coverage Δ
packages/jest-cli/src/watch.js	73.94% <100%> (+0.18%)	⬆️

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[rogeliog]

@chrisbujok I agree it would be great to just set it to new, but I wonder if there are cases where it should have been reseted to all, so probably reseting to the previous one makes more sense... I think @aaronabramov might know better

[github-actions]

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