Enable disableDefaultPropsExceptForClasses (facebook#31804)

TODO: test this PR to see what internal tests fail

Author: rickhanlonii

packages/shared/forks/ReactFeatureFlags.test-renderer.www.js

@@ -72,7 +72,7 @@ export const enableInfiniteRenderLoopDetection = false;
 export const enableReactTestRendererWarning = false;
 export const disableLegacyMode = true;
 
-export const disableDefaultPropsExceptForClasses = false;
+export const disableDefaultPropsExceptForClasses = true;
 
 export const renameElementSymbol = false;