fix mismatch between scene size and gl framebuffer size

[npoltorapavlo]

No description provided.

[codecov]

Codecov Report

Merging #2235 into master will decrease coverage by 0.70%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #2235      +/-   ##
==========================================
- Coverage   71.27%   70.57%   -0.71%     
==========================================
  Files         138      148      +10     
  Lines       20250    24006    +3756     
==========================================
+ Hits        14434    16943    +2509     
- Misses       5816     7063    +1247     

Impacted Files	Coverage Δ
examples/pxScene2d/src/pxScene2d.cpp	68.30% <0.00%> (-1.86%)	⬇️
examples/pxScene2d/src/pxWebGL.h	83.60% <0.00%> (-14.48%)	⬇️
src/unix/rtMutexNative.cpp	88.88% <0.00%> (-11.12%)	⬇️
src/rtThreadPool.cpp	81.25% <0.00%> (-6.25%)	⬇️
examples/pxScene2d/src/pxFont.cpp	73.03% <0.00%> (-5.14%)	⬇️
examples/pxScene2d/src/pxScene2d.h	67.97% <0.00%> (-3.28%)	⬇️
src/pxRect.h	52.83% <0.00%> (-3.17%)	⬇️
src/rtScriptV8/jsCallback.cpp	85.71% <0.00%> (-3.00%)	⬇️
src/unix/rtThreadPoolNative.cpp	73.75% <0.00%> (-2.37%)	⬇️
examples/pxScene2d/src/pxImage.h	78.57% <0.00%> (-2.20%)	⬇️
... and 90 more

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