votes.cgi: Use has_extension

Author: CyberShadow

votes.cgi

@@ -30,8 +30,7 @@ use lib qw(. lib local/lib/perl5);
 use Bugzilla;
 use Bugzilla::Error;
 
-my $is_enabled = grep { $_->NAME eq 'Voting' } @{Bugzilla->extensions};
-$is_enabled || ThrowCodeError('extension_disabled', {name => 'Voting'});
+Bugzilla->has_extension('Voting') || ThrowCodeError('extension_disabled', { name => 'Voting' });
 
 my $cgi = Bugzilla->cgi;
 my $action = $cgi->param('action') || 'show_user';