Fabric: Fixed a bug in ShadowViewMutation constructor

Summary:
Clowntown.
This fixes a recent regression happened becasuse wrong order of parameters in ShadowViewMutation constructor.

Reviewed By: JoshuaGross

Differential Revision: D14329164

fbshipit-source-id: 5a0dc04b889fb3357050b951d56c3e436dbeefb1

ReactCommon/fabric/mounting/ShadowViewMutation.cpp

@@ -14,8 +14,8 @@ ShadowViewMutation ShadowViewMutation::CreateMutation(ShadowView shadowView) {
   return {
       /* .type = */ Create,
       /* .parentShadowView = */ {},
-      /* .newChildShadowView = */ shadowView,
       /* .oldChildShadowView = */ {},
+      /* .newChildShadowView = */ shadowView,
       /* .index = */ -1,
   };
 }