Bug 6521 Follow up: previous patch breaks autoMemberNum functionality

Bug 6521 Follow up: previous patch breaks autoMemberNum functionality

The previous patch broke the autoMemberNum feature by adding a line to fixup_cardnumber
that returned 'undef' for cardnumber in all usages of the subroutine (limited to members/memberentry.pl
and tools/import_borrowers.pl.  This prevented the automatic number from being calculated in all cases.

This patch removes the offending line.

Signed-off-by: Ian Walls <ian.walls@bywatersolutions.com>
Signed-off-by: Nicole Engard <nengard@bywatersolutions.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>