Stray import statement - RCTTouchHandler

Summary:
Closes https://github.com/facebook/react-native/pull/1970
Github Author: Param Aggarwal <paramaggarwal@gmail.com>

React/Modules/RCTUIManager.m

@@ -26,7 +26,6 @@
 #import "RCTScrollableProtocol.h"
 #import "RCTShadowView.h"
 #import "RCTSparseArray.h"
-#import "RCTTouchHandler.h"
 #import "RCTUtils.h"
 #import "RCTView.h"
 #import "RCTViewManager.h"