Session restoration fails when neovim is appimage

[me-nkr]

when neovim used is appimage the executed command path is pointing to somewhere in /tmp directory and will be obviously lost on system restart

I would suggest that we add some way of dealing with this, the following is my suggestion
in _just_command add something like xargs basename sed 's/.*\/\(\w*\)/\1/' which will extract the last part of the path, or something modified to handle the other cases