Use Immutable Record for accounts in Redux state (#26559)

app/javascript/mastodon/actions/store.js

@@ -11,6 +11,7 @@ const convertState = rawState =>
   fromJS(rawState, (k, v) =>
     Iterable.isIndexed(v) ? v.toList() : v.toMap());
 
+
 export function hydrateStore(rawState) {
   return dispatch => {
     const state = convertState(rawState);