Bug 9487: Allow item fields to be used in the HOLDPLACED notice

Bug 9487: Allow item fields to be used in the HOLDPLACED notice

Test Plan:
1) Enable the syspref emailLibrarianWhenHoldIsPlaced
2) Modify the HOLDPLACED notice, add some item level fields
3) Place an item level hold
4) Check the email you receive ( or just look at it from the db )
   You should see the item level fields are new populated
5) Place a title level hold
6) Check the email you receive - item fields are not populated,
   but notice still looks ok.

Signed-off-by: Srdjan <srdjan@catalyst.net.nz>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>