unify enableLegacyHidden

Author: sammy-SC

packages/shared/forks/ReactFeatureFlags.native-fb.js

@@ -74,7 +74,7 @@ export const transitionLaneExpirationMs = 5000;
 
 export const disableSchedulerTimeoutInWorkLoop = false;
 export const enableLazyContextPropagation = false;
-export const enableLegacyHidden = true;
+export const enableLegacyHidden = false;
 export const forceConcurrentByDefaultForTesting = false;
 export const allowConcurrentByDefault = true;
 export const enableCustomElementPropertySupport = false;