Bug 3212 Force leader 9 position to 'a' for new biblios

Bug 3212 Force leader 9 position to 'a' for new biblios

When Creating a new biblio record, if the cataloguer doesn't use the leader
plugin, a biblio record can be saved with a leader not containing a 'a' in 9
position. If the biblio contains UTF-8 characters, its decoding can fail.

This issue applies to MARC-21 not UNIMARC.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
(cherry picked from commit f1f36a0c940fa53a5671b379a31d77c2cbe40a7f)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>