Sets the user's time zone when the session is restored.

[navossoc]

The issue happens when you use persistent login (remember me) feature.

Just open a new tab, make login with remember me option activated... Close your whole browser (so you will loss your session).

Open the webmail again, you will be logged, but the time zone won't be set. (you can see that the time the emails were received has changed)

The time zone is detected at the login form and send with the credentials.

Note: The bug happens only if you didn't save the user time zone on db (user.preferences).

This PR fixes it.

[]'s