i3: fix bug that makes i3lock fail
i3: fix bug that makes i3lock fail

Don't require successful excecution of the killall command.
If the dunst process didn't exist, killall returned non-zero
and then i3lock didn't ran. Now we run killall and
execute i3lock regardless

lathan/dotfiles,lathan/dotfiles,lathan/dotfiles,lathan/dotfiles,lathan/dotfiles