Subscription requests sync in the wrong order

It looks like the subscription/unsubscription requests are sent with the newest first and the oldest last rather than the other way around. This causes issues when, for example, a user subscribes and then immediately unsubscribes within a short period of time. The unsubscription will be processed before the subscription resulting in errors and an incorrect subscription status for the user.

A fix should be relatively easy. Just change the ORDER BY in emf_db_get_requests() to ASC.