Fix issue where percentages were off of the border box, not padding box (#1485)

Summary:
Pull Request resolved: https://github.com/facebook/yoga/pull/1485

X-link: https://github.com/facebook/react-native/pull/41686

The size of the containing block is the size of the padding box of the containing node for absolute nodes. We were looking at  `containingNode->getLayout().measuredDimension(Dimension::Width)` which is the border box. So we need to subtract the border from this.

Added a test that was failing before this change as well

Reviewed By: NickGerleman

Differential Revision: D51330526

fbshipit-source-id: adc448dfb71b54f1bbed0d9d61c5553bda4b106c

yoga/node/Node.cpp

@@ -377,6 +377,11 @@ float Node::getFlexEndPaddingAndBorder(
       getFlexEndBorder(axis, direction);
 }
 
+float Node::getBorderForAxis(FlexDirection axis) const {
+  return getInlineStartBorder(axis, Direction::LTR) +
+      getInlineEndBorder(axis, Direction::LTR);
+}
+
 float Node::getMarginForAxis(FlexDirection axis, float widthSize) const {
   // The total margin for a given axis does not depend on the direction
   // so hardcoding LTR here to avoid piping direction to this function