fw-addr-lists: simplify looping lines

With `:deserialize` the **record** separator is always a new line. The
property `delimiter=` is a **field** reparator, so you can parse a lines
into an array.

We do not want (or need) that, so use new line as field separator. This
will result in an array with just one element, and we use that.

Also convert the data to line feed explicitly, just to be sure.

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