Quick add times buttons for adding time to tickets without typing

addition of a +1 +10 an +1h button underneath the add time box on the add time window of a ticket.

With this, when closing a ticket and adding time, we can go on and quick click 5x +1 and 1x +10 to add 15 minutes to a ticket. Or 2 x +10 to add 20 minutes of time on.