Bug 29321: Remove a last without loop context

This reads better when converted to regular if.
Note that last within such a block is allowed in Perl, but it feels
better to use it only in a loop context.

Test plan:
Read the patch ;)
Bonus: Test if you enter the block by using pref OPACSuggestionMandatoryFields
when adding a suggestion from opac.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>

Edit: Added a space between 'if' and '(' :-D

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

opac/opac-suggestions.pl

@@ -245,8 +245,7 @@ foreach my $suggestion(@$suggestions_loop) {
 my $patron_reason_loop = GetAuthorisedValues("OPAC_SUG", "opac");
 
 my @mandatoryfields;
-{
-    last unless ($op eq 'add');
+if ( $op eq 'add' ) {
     my $fldsreq_sp = C4::Context->preference("OPACSuggestionMandatoryFields") || 'title';
     @mandatoryfields = sort split(/\s*\,\s*/, $fldsreq_sp);
     foreach (@mandatoryfields) {