Fix user state in existing Laravel installation

[jasonvarga]

The change in this commit is incorrect:

dbb9e6d

When you install Statamic into an existing Laravel application, content and users will be stored as flat files.

As it said before this change, users are set up to be stored in the database. The statamic/statamic repo has config files changed to store as flat files. If you have an existing Laravel app, those changes wouldn't be there, so you'd still have the DB setup.

cc @duncanmcclean