fix: element could be double-proxied

[theKashey]

Still walking around React+TypeScript solution, trying to find a better(a faster) way to handle it (@Akuukis, I did not forget about your PR), and this is yet another finding.

Bug: components could be double proxied, if someone, by some reason uses "pre-proxied" version or RHL.

[codecov-io]

Codecov Report

Merging #1033 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1033      +/-   ##
==========================================
+ Coverage   86.68%   86.71%   +0.03%     
==========================================
  Files          31       31              
  Lines         826      828       +2     
  Branches      191      191              
==========================================
+ Hits          716      718       +2     
  Misses         91       91              
  Partials       19       19

Impacted Files	Coverage Δ
src/reactHotLoader.js	94.28% <100%> (+0.16%)	⬆️
src/reconciler/proxies.js	100% <100%> (ø)	⬆️

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