Bug 36274: Correct links leading to purchase suggestion page

Bug 36274: Correct links leading to purchase suggestion page

To test:
1. APPLY PATCH
2. As a logged in OPAC user go to 'Your account' > Purchase suggestion. The form should display.
3. Make a suggestion and confirm it works.
4. Try to make a suggestion using title, author, isbn information from an item that already exists.
5. See the "A similar document already exists:" warning. Confirm the suggestion anyways.
6. Set MaxTotalSuggestions to 4 and NumberOfSuggestionDays to 2. Make sure you can still navigate to the purchase suggestion form.
7. Do an OPAC search that will yield no results as a logged in user.
8. Click the "Make a purchase suggestion" link, making sure it works.
9. Turn on AnonSuggestions and log out of the OPAC.
10. Do an OPAC search that will yield no results. Again click the "Make a purchase suggestion", confirm it works.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>