Bug 6927-- Typo in C4::Overdues.pm

Corrected a small typo in overdues.pm to fix a "Undefined subroutine &C4::Members::checkoverdues called at /home/koha/kohaclone/C4/Members.pm line 511." when making calls to GetMemberDetails

This fix suggested by Elliot Davis of UT Tyler, and he did the testing -- I'm just submitting the fix to master for him.  :)

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>

C4/Overdues.pm

@@ -169,7 +169,7 @@ sub checkoverdues {
     my $sth = C4::Context->dbh->prepare(
         "SELECT biblio.*, items.*, issues.*,
                 biblioitems.volume,
-                bibliotiems.number,
+                biblioitems.number,
                 biblioitems.itemtype,
                 biblioitems.isbn,
                 biblioitems.issn,