Bug 31333: (follow-up) Handle anonymous patrons making suggestions

Bug 31333: (follow-up) Handle anonymous patrons making suggestions

Test plan:
1. Enable suggestion & AnonSuggestions sysprefs and set AnonymousPatron = 1
2. Visit the OPAC without logging in
3. Confirm you can successfully create a suggestion from:
- Item detail page
- Search result page
- Masthead under the 'Library catalogue' search box
4. Disable the AnonSuggestions syspref
5. Confirm you cannot see links to make purchase suggestions on the
following pages:
- Item detail page
- Search result page
- Masthead under the 'Library catalogue' search box
6. Confirm if you try visiting /cgi-bin/koha/opac-suggestions.pl page
you are re-directed to a login page
7. Select the category of your user in the suggestionPatronCategoryExceptions syspref
8. Log into the OPAC
9. Confirm you cannot see links to make purchase suggestions on the
following pages:
- Item detail page
- Search result page
- Masthead under the 'Library catalogue' search box
- opac-user.pl ('Your summary') page
10. Confirm if you try visiting /cgi-bin/koha/opac-suggestions.pl page
you are re-directed to a 404 error page
11. Enable AnonSuggestions syspref
12. Confirm you can successfully create a suggestion from:
- Item detail page
- Search result page
- Masthead under the 'Library catalogue' search box
- opac-user.pl ('Your summary') page
13. Disable AnonSuggestions syspref and un-check your category from
suggestionPatronCategoryExeptions syspref
14. Confirm you can create a suggestion from:
- Item detail page
- Search result page
- Masthead under the 'Library catalogue' search box
- opac-user.pl ('Your summary') page

Sponsored-by: Catalyst IT, New Zealand
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>