Fix "Add or remove from list" crashing the page

Fixes https://gitlab.com/soapbox-pub/soapbox/-/issues/1493

app/soapbox/reducers/list-adder.ts

@@ -32,7 +32,7 @@ export default function listAdderReducer(state: State = ReducerRecord(), action:
       return ReducerRecord();
     case LIST_ADDER_SETUP:
       return state.withMutations(map => {
-        map.set('accountId', action.account.get('id'));
+        map.set('accountId', action.account.id);
       });
     case LIST_ADDER_LISTS_FETCH_REQUEST:
       return state.setIn(['lists', 'isLoading'], true);