Use layout width for BoringLayout in Nodes

Summary:
In D2980358, alignment was implemented for nodes. This unfortunately
introduced a bug, which is that when we have a BoringLayout that is set to
ALIGN_CENTER, it can't be seen. This is a result of the fact that the width
passed in to BoringLayout is Integer.MAX_VALUE. Since measure has already
been called at this point, we can just pass the layout's width as the width
of the BoringLayout.

Reviewed By: sriramramani

Differential Revision: D3004971

ReactAndroid/src/main/java/com/facebook/react/flat/RCTText.java

@@ -173,7 +173,7 @@ import com.facebook.react.uimanager.annotations.ReactProp;
       mDrawCommand = new DrawTextLayout(new BoringLayout(
           mText,
           PAINT,
-          Integer.MAX_VALUE, // fits one line so don't care about the width
+          (int) getLayoutWidth(),
           mAlignment,
           mSpacingMult,
           mSpacingAdd,