Init executeRef also when executeFormAction is used

Without assigning the result of a resolved form action to the
exectureRef the `onError` callback is not called

packages/zsa-react/src/index.ts

@@ -216,6 +216,7 @@ export const useServerAction = <
         startTransition(() => {
           internalExecute(opts[0])
         })
+        executeRef.current = resolve
         resolve(null)
       })
     },