Remove orphaned disableJavaScriptURLs reference

Fixes `yarn flow dom-node` on `main`:https://app.circleci.com/jobs/github/facebook/react/813807

Author: eps1lon

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

@@ -52,7 +52,6 @@ export const enableCacheElement = __NEXT_RN_MAJOR__;
 export const enableTaint = __NEXT_RN_MAJOR__;
 export const enableUnifiedSyncLane = __NEXT_RN_MAJOR__;
 export const enableFizzExternalRuntime = __NEXT_RN_MAJOR__; // DOM-only
-export const disableJavaScriptURLs = __NEXT_RN_MAJOR__; // DOM-only
 export const enableBinaryFlight = __NEXT_RN_MAJOR__; // DOM-only
 export const enableCustomElementPropertySupport = __NEXT_RN_MAJOR__; // DOM-only
 export const enableServerComponentKeys = __NEXT_RN_MAJOR__;