Bug 16054: Fix variable scope error in paycollect.pl

Bug 16054: Fix variable scope error in paycollect.pl

$borrower, $borrowernumber and $template and not visible in the
subroutine.
Using $b_ref and passing $template fixes the issue.

Test plan:
Under plack, use the pay selected button.
On the paycollect page, you should see the image of the patron

It certainly fixes some other bugs.

Signed-off-by: Srdjan <srdjan@catalyst.net.nz>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Brendan Gallagher brendan@bywatersolutions.com