dir, system-helper: Don't ignore errors when getting a remote's URL

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Of the 27 instances where ostree_repo_remote_get_url() is used, these
are the only ones where the return value is ignored.  This triggers
Coverity.

It might not always be strictly necessary to handle the errors, but
doing so can only help with debugging.  However, in the case of
flatpak_dir_get_remote_disabled() this clarifies the subtle difference
between an empty URL (ie., ""), and a NULL URL caused by a corrupt
configuration file or a missing "url" key.

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500 Internal Server Error

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