Fix check to be Stow compatible when calling dotin link from another folder

[marcospb19]

After running

cd ~/dotfiles
stow GROUP

if you run this the checks succeed:

cd
dotin link GROUP

example output:

OK: skipping already-existing link at "/home/marcospb19/.fehbg"

However, if you run the same command from another folder:

cd ~/dotfiles
dotin link GROUP

the checks fail with this message

Conflict: skipping creating link at "/home/marcospb19/.fehbg", the symlink already
                             exists, but it points to "dotfiles/wallpaper/.fehbg", which is not the right location,
                             expected it to point to "/home/marcospb19/dotfiles/wallpaper/.fehbg"