Delete redundant branch in ReactElement and HTMLElement plugins

[pedrottimark]

Summary

The changes because of excellent Flow strict_call_arity in #3568 make it clear that if else if else statements can become if else in two plugins of pretty-format package.

Test plan

Jest

[codecov-io]

Codecov Report

Merging #3731 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3731      +/-   ##
==========================================
+ Coverage   62.64%   62.65%   +<.01%     
==========================================
  Files         183      183              
  Lines        6709     6705       -4     
  Branches        6        6              
==========================================
- Hits         4203     4201       -2     
+ Misses       2503     2501       -2     
  Partials        3        3

Impacted Files	Coverage Δ
packages/pretty-format/src/plugins/HTMLElement.js	94.28% <100%> (+5.09%)	⬆️
packages/pretty-format/src/plugins/ReactElement.js	100% <100%> (ø)	⬆️

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[thymikee]

Man, I've seen this message and I was really hoping Flow started to do something on dead code elimination 😄. Good catch!

[cpojer]

Thank you!

[github-actions]

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