Incorrect Keys in FolderViewController Causing Wrong Animations

[brynbodayle]

These keys in FolderViewController are reversed and cause some changes to call reloadData instead of the correct insert animation. This incorrect code is in the book as well.

let oldValue = userInfo[Item.newValueKey]
let newValue = userInfo[Item.oldValueKey]

https://github.com/objcio/app-architecture/blob/master/Recordings-MVC/Recordings/FolderViewController.swift#L42-L43

[OmranK]

Confirmed, switch the values to make animation work correctly.