Bug 3723 Correct return of Institution in Patron Info Resp

Bug 3723 Correct return of Institution in Patron Info Resp

While the comment correctly notes that the order of variable length
fields is not fixed some units expect mandatory fields to
follow the sequence in the protocol definition and fail
parsing otherwise. Moved institution id to its expected
place in the patron information response.

Indented the first half of the if (patron_valid) so its clearer
that two cases are handled here.

Signed-off-by: Galen Charlton <gmcharlt@gmail.com>