Fixed minor math issue in gradual volume increasing
Fixed minor math issue in gradual volume increasing

rgov/mopidy-alarmclock,rgov/mopidy-alarmclock,michaellunzer/mopidy-alarmclock,DavisNT/mopidy-alarmclock,DavisNT/mopidy-alarmclock,michaellunzer/mopidy-alarmclock,rgov/mopidy-alarmclock,DavisNT/mopidy-alarmclock,michaellunzer/mopidy-alarmclock