Bug 35310: Show current renewal value of the currently active check out

Bug 35310: Show current renewal value of the currently active check out

Test plan, with the previous 2 patches applied:

1) Checkout an item to Koha user, barcode 39999000003192
2) Renew that barcode
3) Visit the items page of the biblio record, click on 'View' in front of 'Current renewals'
/cgi-bin/koha/catalogue/moredetail.pl?biblionumber=76
4) Notice it shows the renewals as expected
5) Return the same item: 39999000003192
6) Repeat 1) to 3). Notice it shows 2 current renewals even tho only 1 corresponds to the currently active check out
7) Renew again. Notice it shows 3 current renewals even tho only 2 correspond to the currently active check out
7) Apply this patch. Notice it now only shows 2 current renewals

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>