Simplify check for -0 in printNumber

[Connormiha]

Summary

Objest.is is the easiest way to compare 0 and -0. Also it doesn't need special check for NaN, because String work corrent.

Test plan

[codecov-io]

Codecov Report

Merging #5581 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #5581      +/-   ##
==========================================
- Coverage   60.63%   60.61%   -0.02%     
==========================================
  Files         213      213              
  Lines        7311     7308       -3     
  Branches        3        4       +1     
==========================================
- Hits         4433     4430       -3     
  Misses       2877     2877              
  Partials        1        1

Impacted Files	Coverage Δ
packages/pretty-format/src/index.js	96.37% <100%> (-0.08%)	⬇️

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[cpojer]

Nice!

[github-actions]

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