Bug 28941: Filter suggestion inputs at the OPAC

Bug 28941: Filter suggestion inputs at the OPAC

The following sequence is bad:
46 my $suggestion      = $input->Vars;

181         &NewSuggestion($suggestion);

All columns can be set when we insert the suggestion into the DB
We definitely want to avoid the following fields to be set by the final
user: acceptedby, accepteddate, STATUS, etc...

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>