Bug 36915: (follow-up) Pass object to GetPreparedLetter

Bug 36915: (follow-up) Pass object to GetPreparedLetter

This patch updates the logic to pass the object to be deleted through to
GetPreparedLetter.

This way, as we add fields and accessors to the object in the future,
they will automatically become available to the notices.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>