Bug 31685: Replace current_article_requests_count in opac-user

Bug 31685: Replace current_article_requests_count in opac-user

Fixing the "( total)" in the caption of the table.

The tt var should be replaced now by current_article_requests.size.
Note that current_article_requests is an array now (from as_list).
We cannot use .count since it is no Koha object.

Test plan:
Submit a few article requests.
Check OPAC account page, and verify that both totals are fine now.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>