Bug 18274: C4::Items - Remove GetItemStatus

Bug 18274: C4::Items - Remove GetItemStatus

This subroutine is no longer in used.
It was previously call from serials/serials-recieve.pl, which was not used and has been removed by
    commit 65b7ad030cd5cd0e3148fbbd1496d31b5cf149f7
    Bug 13423: Remove unused serials-recieve

Test plan:
  git grep GetItemStatus
should not return any used calls (only 1 occurrence in release notes)

Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>