Persist submission form values with apollo-link-state

To try it out:

1. On the dashboard, click "Submit a manuscript"
2. Fill out the form
3. Click "Next"
4. On the file upload dummy page, click "Author details" to return to the form
5. The values you entered should still be there

app/app.js

@@ -3,7 +3,6 @@ import ReactDOM from 'react-dom'
 import { AppContainer } from 'react-hot-loader'
 import createHistory from 'history/createBrowserHistory'
 import { withClientState } from 'apollo-link-state'
-import { defaultsDeep } from 'lodash'
 
 import { configureStore, Root } from 'pubsweet-client'
 
@@ -16,9 +15,10 @@ const history = createHistory()
 const store = configureStore(history, {})
 
 const makeApolloConfig = ({ cache, link, ...config }) => {
-  const clientStateLink = withClientState(
-    defaultsDeep({ cache }, AuthorDetailsSchema.clientStateConfig),
-  )
+  const clientStateLink = withClientState({
+    cache,
+    ...AuthorDetailsSchema.clientStateConfig,
+  })
 
   return {
     cache,