Bug 28386: Remove _others_ from the contributor list

We arbitrarily use "_others_" for unknown contributors (biblibre,
bywater, ptfs-e teams, etc)

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

about.pl

@@ -681,6 +681,7 @@ my $contributors =
   -e "$docdir" . "/contributors.yaml"
   ? YAML::XS::LoadFile( "$docdir" . "/contributors.yaml" )
   : {};
+delete $contributors->{_others_};
 for my $version ( sort { $a <=> $b } keys %{$teams->{team}} ) {
     for my $role ( keys %{ $teams->{team}->{$version} } ) {
         my $normalized_role = "$role";