Bug 29173: (QA follow-up) Match pop-over sizes

Bug 29173: (QA follow-up) Match pop-over sizes

As suggested by David Nind, this patch updates the call to z3950 search
on the authority edit page to match the sizing of the one from the
details page.

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit d25b7459b4ff4fd9f6acd539ab547fcb57dac6e0)
Signed-off-by: Jacob O'Mara <jacob.omara@ptfs-europe.com>
(cherry picked from commit 353d9dda3e4dfe6f8c446b50f73e3c489cf75d64)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>