BanCommit: Only record timezone from server identity

If we really want to use the server identity from a singleton we
should use a Provider, which will evaluate to the current time.
However, in this case we just need the timezone for constructing an
identity from the current user. Make this explicitly the only
dependency.

Change-Id: Iba29d2a5dddb17eb5a9803fc1bf7bbfc06e0f4d9
1 file changed