Remove unused var in NativeAnimatedNodesManager

Summary:
Should have been removed in 6f5433febe (commitcomment-19793695).

Simple enough fix.

cc/ janicduplessis
Closes https://github.com/facebook/react-native/pull/11178

Differential Revision: D4239876

fbshipit-source-id: f96e220ffdab042bded27ff16d2395741c70b61f

ReactAndroid/src/main/java/com/facebook/react/animated/NativeAnimatedNodesManager.java

@@ -480,7 +480,6 @@ import javax.annotation.Nullable;
     // Cleanup finished animations. Iterate over the array of animations and override ones that has
     // finished, then resize `mActiveAnimations`.
     if (hasFinishedAnimations) {
-      int dest = 0;
       for (int i = mActiveAnimations.size() - 1; i >= 0; i--) {
         AnimationDriver animation = mActiveAnimations.valueAt(i);
         if (animation.mHasFinished) {