chore: always animate keyboard height change if possible on iOS

If the keyboard event has non-zero duration, animate the change to the
target height. Prevents jumping to the target height when opening the
floating keyboard.

packages/react-native-reanimated/apple/reanimated/apple/keyboardObserver/REAKeyboardEventObserver.mm

@@ -209,7 +209,6 @@ - (void)keyboardWillChangeFrame:(NSNotification *)notification
   _targetKeyboardHeight =
       CGRectIsEmpty(endFrameIntersection) ? 0 : CGRectGetMaxY(window.bounds) - CGRectGetMinY(endFrameIntersection);
 
-  bool forceAnimation = false;
   auto keyboardView = [self getKeyboardView];
   if (_state == CLOSING) {
     _targetKeyboardHeight = 0;
@@ -219,12 +218,10 @@ - (void)keyboardWillChangeFrame:(NSNotification *)notification
     _initialKeyboardHeight = CGRectIsEmpty(beginFrameIntersection)
         ? 0
         : CGRectGetMaxY(window.bounds) - CGRectGetMinY(beginFrameIntersection);
-    forceAnimation = true;
   }
   _isInteractiveDismissalCanceled = false;
 
-  bool hasKeyboardAnimation = [self hasAnyAnimation:keyboardView];
-  if (hasKeyboardAnimation || forceAnimation) {
+  if (animationDuration > 0) {
     _measuringView.frame = CGRectMake(0, -1, 0, _initialKeyboardHeight);
     [UIView animateWithDuration:animationDuration
                      animations:^{