[mkcal] Restrict event reminder automatic snoozing to 2 times

Set the timed enabler for maximum number of snoozes that the event reminder can be automatically snoozed as a result of user inactivity. If the user does not respond to the event reminder for a third time, then timed will dismiss the reminder. The event reminder will be shown a total of three times in case the user does not react to it.

Note: setting maximal timeout snooze counter does not automatically provide autosnoozing functionality, it facilitates it. If the flag is set, then calling Maemo::Timed::Interface:dialog_response_async(<cookie> , 0), where the last parameter indicates "closed due to user inactivity" will increse the automatic snooze counter, and so automatic snoozing/dismissing.

This pull request depends on this timed PR: https://github.com/nemomobile/timed/pull/48, update spec file accordingly and merge after the timed PR is merged.