Fix for when '_segmentsCount' can return NaN

[themoonrat]

If the moveTo y value and the quadraticCurveTo cpY and toY values are all the same, then QuadraticUtils.curveLength returns NaN, causing GRAPHICS_CURVES._segmentsCount to return NaN.

Demo: https://www.pixiplayground.com/#/edit/8jAg09k2W~L85zPt~ZfU_
Open up the console, put a breakpoint on const n = GRAPHICS_CURVES._segmentsCount and refresh the playground. Notice that 'n' will resolve to NaN.

This is probably not the right solution for this, fixing the symptom rather than the cause, but just in case it's fine, here's the PR!

[codecov-io]

Codecov Report

Merging #6231 into dev will increase coverage by 0.93%.
The diff coverage is 86.57%.

@@            Coverage Diff             @@
##              dev    #6231      +/-   ##
==========================================
+ Coverage   76.98%   77.92%   +0.93%     
==========================================
  Files         202      186      -16     
  Lines       10238    10109     -129     
==========================================
- Hits         7882     7877       -5     
+ Misses       2356     2232     -124

Impacted Files	Coverage Δ
packages/display/src/Bounds.js	91.04% <ø> (-0.05%)	⬇️
packages/sprite-tiling/src/TilingSprite.js	71.59% <ø> (ø)	⬆️
...kages/settings/src/utils/maxRecommendedTextures.js	18.75% <ø> (ø)	⬆️
packages/settings/src/settings.js	100% <ø> (ø)	⬆️
packages/text-bitmap/src/BitmapFontLoader.js	75% <ø> (ø)	⬆️
packages/settings/src/utils/canUploadSameBuffer.js	100% <ø> (ø)	⬆️
packages/mesh/src/Mesh.js	61.48% <0%> (-0.42%)	⬇️
packages/sprite/src/Sprite.js	92.15% <0%> (-0.46%)	⬇️
packages/sprite-tiling/src/TilingSpriteRenderer.js	7.27% <0%> (-0.28%)	⬇️
packages/core/src/shader/utils/compileProgram.js	56.66% <0%> (-7.62%)	⬇️
... and 21 more

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[bigtimebuddy]

Thanks @themoonrat!