Fix CircleCI breakage in RCTPropsAnimatedNode (facebook#29800)

Summary:
Pull Request resolved: facebook#29800

I changed this line in D23272735 (facebook@700960c), to conform to normal ObjC semantics: impl files can import their header by file name.

I forgot that their's some special linking logic happening in this directory that doesn't allow for this import type.

This diff just reverts one line to fix CircleCI builds.

Changelog: [Internal]

Reviewed By: shergin

Differential Revision: D23399893

fbshipit-source-id: 976199c659522effd632aaeb38616d0d6c962f1f

Libraries/NativeAnimation/Nodes/RCTPropsAnimatedNode.m

@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-#import "RCTPropsAnimatedNode.h"
+#import <React/RCTPropsAnimatedNode.h>
 
 #import <React/RCTAnimationUtils.h>
 #import <React/RCTLog.h>