EXP-1506 FIXED starting the toast fade timer when a toast is overlapped by...

EXP-1506 FIXED starting the toast fade timer when a toast is overlapped by other floater like avatar inspector.
This is a kind of a workaround: perhaps the logic of updating the toast fade timer should be refactored to start/stop the timer from onMouseLeave/onMouseEnter callbacks instead of using "IsHovered" flag for each toast.