Fix alarms not disabling if they are set to run once
It appears the code was not added to the refactoring: https://invent.kde.org/plasma-mobile/kclock/-/blob/d173b716dd3c68b5c8ec23f7ae4fe63bd5776875/src/alarms.cpp#L258
This MR disables alarms once they are dismissed if they are set to run once (did not select any days of the week to repeat).