Bug 34916: Fix wrong borrowernumber in ArticleRequests.t

Bug 34916: Fix wrong borrowernumber in ArticleRequests.t

Simple fix: Send patron to userenv instead of library only.

Test plan:
Do not apply patch.
Remove borrowernumber 51.
Run t/db_dependent/Koha/ArticleRequests.t. (FAIL)
Apply patch, rerun test (PASS)

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 7d93d18548d02b1b634db09356caf18795a6ddbf)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>