just: fix quotes

[rsteube]

fix #2465

[azzamsa]

I wanted to learn where the root cause but this commit contains a lot of unrelated changes 😢

[rsteube]

Just look at recipe.go.
The rest is an update to the flags.

I did a simple string split before using --list, but you got ='' in there as well which was included in the results:

esh ❯ just --list 
Available recipes:
    another service=''     # another
    image-start service='' # Run the container
    i service=''           # alias for `image-start`
    test

Now I'm parsing the json from --dump --dump-format json.