Bug 16317 - Attempt to share private list results in error

When sharing a private list, the the receiver of the share link will get
the following error when they are logged in and try to click the link:

DBIx::Class::Storage::DBI::_dbh_execute(): Unknown column 'sharedate
desc' in 'order clause' at /home/koha/kohaclone/Koha/Objects.pm line 150

Test Plan:
1) Create a private list
2) Share that list to another account
3) Log in as the other account
4) Click the link in the email you recieved
5) Note the error
6) Apply this patch
7) Click the link again
8) You should see no error and be able to view the list!

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>

Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>

opac/opac-shareshelf.pl

@@ -138,7 +138,7 @@ sub show_accept {
             shelfnumber => $param->{shelfnumber},
         },
         {
-            order_by => 'sharedate desc',
+            order_by => { -desc => 'sharedate' },
             limit => 1,
         }
     );