bug#32020: 3 bash-completion errors

[swedebugia]

Hi

When using -m after guix package, weather, build; bash tries to expand
on names of packages instead of files in the filesystem.

After guix build --load-path= bash does not expand. It should expand in
the local filesystem I think.

(nitpicking)
Also when expanding on "-" after guix weather; bash suggests: "--e"
among valid completions but it is NOT. Same happens after guix build.
Havent tested the others.

-- 
Cheers 
Swedebugia