Fabric: preserve original props when using fallback component

Summary: This fixes a minor bug where the original props (like for styling) got dropped when the system falls back to UnimplementedView.

Reviewed By: mdvacca

Differential Revision: D14898906

fbshipit-source-id: 4a07952ceac66e491a5c0bc1ffd99f21438cda31

Author: fkgozali

ReactCommon/fabric/uimanager/UIManager.cpp

@@ -32,7 +32,7 @@ SharedShadowNode UIManager::createNode(
               fallbackDescriptor->getComponentHandle() ==
                   componentDescriptor.getComponentHandle()
           ? componentDescriptor.cloneProps(
-                nullptr, RawProps(folly::dynamic::object("name", name)))
+                props, RawProps(folly::dynamic::object("name", name)))
           : props,
       /* .eventEmitter = */
       componentDescriptor.createEventEmitter(std::move(eventTarget), tag),