Remove comparison to `YGUndefined` *and* `0.0f`
Remove comparison to `YGUndefined` *and* `0.0f`

Summary: Removes a check introduced in D6969537, comparing `totalFlexGrowFactors` and `resolveFlexGrow` to both `0.0` *and* undefined.

Reviewed By: SidharthGuglani

Differential Revision: D15431425

fbshipit-source-id: 13c8f24e1bc8c49496097a6aa78e20ee5d3964a7

exponent/react-native,arthuralee/react-native,pandiaraj44/react-native,janicduplessis/react-native,exponent/react-native,exponent/react-native,exponent/react-native,janicduplessis/react-native,hoangpham95/react-native,pandiaraj44/react-native,exponentjs/react-native,hammerandchisel/react-native,hammerandchisel/react-native,myntra/react-native,myntra/react-native,javache/react-native,arthuralee/react-native,exponent/react-native,javache/react-native,pandiaraj44/react-native,facebook/react-native,facebook/react-native,myntra/react-native,pandiaraj44/react-native,hammerandchisel/react-native,javache/react-native,hammerandchisel/react-native,myntra/react-native,pandiaraj44/react-native,exponentjs/react-native,janicduplessis/react-native,javache/react-native,exponentjs/react-native,arthuralee/react-native,arthuralee/react-native,janicduplessis/react-native,hammerandchisel/react-native,hoangpham95/react-native,myntra/react-native,facebook/react-native,facebook/react-native,javache/react-native,arthuralee/react-native,hammerandchisel/react-native,exponentjs/react-native,myntra/react-native,exponent/react-native,pandiaraj44/react-native,facebook/react-native,janicduplessis/react-native,exponent/react-native,hoangpham95/react-native,janicduplessis/react-native,hoangpham95/react-native,exponentjs/react-native,exponentjs/react-native,hoangpham95/react-native,exponent/react-native,pandiaraj44/react-native,myntra/react-native,hoangpham95/react-native,myntra/react-native,pandiaraj44/react-native,myntra/react-native,hammerandchisel/react-native,facebook/react-native,facebook/react-native,exponentjs/react-native,exponentjs/react-native,facebook/react-native,javache/react-native,janicduplessis/react-native,facebook/react-native,javache/react-native,hoangpham95/react-native,janicduplessis/react-native,hoangpham95/react-native,hammerandchisel/react-native,javache/react-native,javache/react-native