Bug 33002: Restore "Archive selected" for archiving multiple suggestions

Bug 33002: Restore "Archive selected" for archiving multiple suggestions

It looks like this button, added by bug 30599 was later
accidentally removed again. This is giving it a comeback.

To test:
1 - Apply patch
2 - Create some purchase suggestions
3 - Select several suggestions
4 - Click 'Archive selected'
5 - Suggestions are archived
6 - You can view archived suggestions by selecting 'Suggestion information'->'Include archived'

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>