Bug 22800: (bug 22550 follow-up) Do not raw filter when not necessary (OPAC suggestions)

Bug 22800: (bug 22550 follow-up) Do not raw filter when not necessary (OPAC suggestions)

This is a follow-up for bug 22550, we do not need to use the $raw
filter.

Test plan:
Same as bug 22550:
Test plan:
Test plan:
1. OPAC->login->your purchase suggestions->New purchase suggestion
2. Click button "Submit your suggestion" directly without filling in any field.
   Empty suggestion record was added succeffully.
3. Apply the patch.
4. Click button "Submit your suggestion" directly without filling in any field.
   The required fields should be labeled in red.
   (you can change the mandatory fields by preference
   'OPACSuggestionMandatoryFields')

Signed-off-by: Bin Wen <bin.wen@inlibro.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>