fix(rn): withConfig import

Signed-off-by: Godefroy Ponsinet <godefroy.ponsinet@outlook.com>

client/react-native/app/relay/config.js

@@ -1,5 +1,6 @@
 import React, { PureComponent } from 'react'
-import { RelayContext, QueryReducer } from './context'
+import { RelayContext } from './context'
+import QueryReducer from './QueryReducer'
 import { View } from 'react-native'
 import { withHOC, withContext } from '@berty/common/helpers/views'