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

yoga/Yoga.cpp

@@ -2859,11 +2859,8 @@ static void YGNodelayoutImpl(
         availableInnerMainDim = maxInnerMainDim;
       } else {
         if (!node->getConfig()->useLegacyStretchBehaviour &&
-            ((YGFloatIsUndefined(
-                  collectedFlexItemsValues.totalFlexGrowFactors) &&
-              collectedFlexItemsValues.totalFlexGrowFactors == 0) ||
-             (YGFloatIsUndefined(node->resolveFlexGrow()) &&
-              node->resolveFlexGrow() == 0))) {
+            (collectedFlexItemsValues.totalFlexGrowFactors == 0 ||
+             node->resolveFlexGrow() == 0)) {
           // If we don't have any children to flex or we can't flex the node
           // itself, space we've used is all space we need. Root node also
           // should be shrunk to minimum