Bug 16465: discharge - Add a title tag at the OPAC

Bug 16465: discharge - Add a title tag at the OPAC

Test plan:
Confirm that the opac-discharge.pl has now a title

Signed-off-by: Srdjan <srdjan@catalyst.net.nz>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
(cherry picked from commit 27254de06d8ae6682b395be48d6ba02b69f9e917)
Signed-off-by: Frédéric Demians <f.demians@tamil.fr>
(cherry picked from commit 5ce7baf937d8e7ddf56ca0ae4dde00690fe5a32c)
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>