Make enableSuspenseLayoutEffectSemantics static for www (facebook#21617)

This has been ramped up to 80% GK so the next step is to just turn it on for 100%

Author: Brian Vaughn

packages/shared/forks/ReactFeatureFlags.www.js

@@ -26,7 +26,6 @@ export const {
   enableDebugTracing,
   skipUnmountedBoundaries,
   createRootStrictEffectsByDefault,
-  enableSuspenseLayoutEffectSemantics,
   enableUseRefAccessWarning,
   disableNativeComponentFrames,
   disableSchedulerTimeoutInWorkLoop,
@@ -38,6 +37,8 @@ export const {
 // On WWW, __EXPERIMENTAL__ is used for a new modern build.
 // It's not used anywhere in production yet.
 
+export const enableSuspenseLayoutEffectSemantics = true;
+
 export const enableStrictEffects =
   __DEV__ && dynamicFeatureFlags.enableStrictEffects;
 export const debugRenderPhaseSideEffectsForStrictMode = __DEV__;