revert: "feat: enable 'Overlay Calendar' enabled by default for signed in users (#18188)" (#20600)

This reverts commit 46c7afade6.

packages/platform/atoms/booker/BookerWebWrapper.tsx

@@ -209,11 +209,6 @@ export const BookerWebWrapper = (props: BookerWebWrapperAtomProps) => {
       )
   );
 
-  useEffect(() => {
-    // Enable 'Overlay Calendar' by default for signed in users
-    if (hasSession) onOverlaySwitchStateChange(true);
-  }, [hasSession]);
-
   return (
     <BookerComponent
       {...props}