remove duplicate code in FabricUIManager

Summary:
remove duplicate code in FabricUIManager

The removed line is already called few lines above

changelog: [internal] internal

Reviewed By: JoshuaGross

Differential Revision: D34553849

fbshipit-source-id: 2e0102a77e7464c9803fb1175385fdafbb88f1fa

ReactAndroid/src/main/java/com/facebook/react/fabric/FabricUIManager.java

@@ -428,11 +428,6 @@ public class FabricUIManager implements UIManager, LifecycleEventListener {
     mReactApplicationContext.removeLifecycleEventListener(this);
     onHostPause();
 
-    // This is not technically thread-safe, since it's read on the UI thread and written
-    // here on the JS thread. We've marked it as volatile so that this writes to UI-thread
-    // memory immediately.
-    mDispatchUIFrameCallback.stop();
-
     mBinding.unregister();
     mBinding = null;