Using login flow when registration broken when user exists

[thijsnado]

I get an error when logging in with a user that has an account. I suspect because https://github.com/pow-auth/pow_assent/blob/master/lib/pow_assent/plug.ex#L163 comes before https://github.com/pow-auth/pow_assent/blob/master/lib/pow_assent/plug.ex#L168 which means it doesn't check for a successful user identity upsert.

[danschultzer]

Thanks for the patience, fixed in v0.4.14!