fix import inside enhancers typescript test (reduxjs#3559)

Author: cellog

test/typescript/enhancers.ts

@@ -1,5 +1,11 @@
-import { PreloadedState } from '../../index'
-import { StoreEnhancer, Action, AnyAction, Reducer, createStore } from 'redux'
+import {
+  StoreEnhancer,
+  Action,
+  AnyAction,
+  Reducer,
+  createStore,
+  PreloadedState
+} from 'redux'
 
 interface State {
   someField: 'string'