Bug 21048: Fix display of suggestion's status (SUGGEST_STATUS)

Bug 21048: Fix display of suggestion's status (SUGGEST_STATUS)

When a suggestion's status is set to a customized value (AV
SUGGEST_STATUS), the description is not always displayed correctly.

Test plan:
- Create different values for the AV SUGGEST_STATUS
- Create several suggestions
- Change the status using the SUGGEST_STATUS values
- Edit the suggestion and change again the status
- View the suggestions for a given patron
(members/purchase-suggestions.pl?borrowernumber=XX), the statuses must
displayed correctly

Signed-off-by: Lisette Scheer <lisetteslatah@gmail.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>