Statically enable suspense/partial hydration flag in www (facebook#14842)

It doesn't hurt to have this always on since it is only when we use
Suspense that it matters. This saves some code/checks.

Author: sebmarkbage

packages/shared/forks/ReactFeatureFlags.www.js

@@ -14,7 +14,6 @@ import typeof * as FeatureFlagsShimType from './ReactFeatureFlags.www';
 export const {
   debugRenderPhaseSideEffects,
   debugRenderPhaseSideEffectsForStrictMode,
-  enableSuspenseServerRenderer,
   replayFailedUnitOfWorkWithInvokeGuardedCallback,
   warnAboutDeprecatedLifecycles,
   disableInputAttributeSyncing,
@@ -35,6 +34,8 @@ export const enableSchedulerDebugging = true;
 
 export const enableStableConcurrentModeAPIs = false;
 
+export const enableSuspenseServerRenderer = true;
+
 let refCount = 0;
 export function addUserTimingListener() {
   if (__DEV__) {