fish: erased functions still get autoloaded

[rsteube]

completions need to be invoked once before they can be replaced so that they are not autoloaded:

complete --do-complete 'chown ' > /dev/null
complete --erase -c 'chown'
complete -c 'chown' -f -a '(_carapace_lazy chown)'

needs: https://github.com/fish-shell/fish-shell/issues/6716

[rsteube]

workaround:

touch ~/.config/fish/completions/chown.fish