i3-exit: add lock button, use i3lock (not i3-lock)
i3-exit: add lock button, use i3lock (not i3-lock)

scorpiovn/dotfiles,blueyed/dotfiles,blueyed/dotfiles,scorpiovn/dotfiles,blueyed/dotfiles,blueyed/dotfiles,scorpiovn/dotfiles,scorpiovn/dotfiles,scorpiovn/dotfiles,blueyed/dotfiles