Chouette::Line#by_name: Use `LEFT OUTER JOIN` on "companies"

Thanks to Johan for helping me with this. He correctly remarked that
what I had before will do an `INNER JOIN`, which ends up excluding lines
that don't have an associated company. I didn't really think about the
data, and didn't realise we had lines without a company.

Big thanks to Johan for seeing that I needed to add `public.` to qualify
the `companies` table in order for the join to work. Otherwise it
doesn't work correctly and we can't filter by company name.

Refs #5889

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