fix(toPixelData): Correct width and height per pixelRatio

[vvo]

Before this commit, toPixelData when used with pixelRatio would fail to get the correct image size and would only get half of it for example when using pixelRatio of 2 (default of hd screens I believe).

Fixes #276

[biiibooo]

👋 @vvo

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.50%. Comparing base (d9b2fcf) to head (fe45bc8).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #546   +/-   ##
=======================================
  Coverage   66.50%   66.50%           
=======================================
  Files          10       10           
  Lines         612      612           
  Branches      150      150           
=======================================
  Hits          407      407           
  Misses        144      144           
  Partials       61       61           

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[vvo]

I moved to https://github.com/bubkoo/html-to-image