Update hotkeys behavior

This will make the "Use on target" hot keys default to cross-hair when we do not have any target. It is easier if the hotkey works this way rather than aiming manually or setting up a separate "With crosshair" hot key for the same item. Cipsoft Client has it as well, and while I do realize that otclient is not meant to reassemble their client completely, it is still a nice feature to have.