Hardcode AbsolutePercentageAgainstPaddingEdge experimental feature to false (#1549)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1549

X-link: https://github.com/facebook/react-native/pull/42253

This experimental feature is always false, and with the next diff I will be deleting the branch that actually calls into this. Separating this diff out to simplify the review process.

Reviewed By: NickGerleman

Differential Revision: D52705765

fbshipit-source-id: 705f4aa297eae730af9b44753eb01c9dec385dcf

yoga/YGEnums.cpp

@@ -111,8 +111,6 @@ const char* YGExperimentalFeatureToString(const YGExperimentalFeature value) {
   switch (value) {
     case YGExperimentalFeatureWebFlexBasis:
       return "web-flex-basis";
-    case YGExperimentalFeatureAbsolutePercentageAgainstPaddingEdge:
-      return "absolute-percentage-against-padding-edge";
   }
   return "unknown";
 }