[Fix] Update mailing lists addresses.

(cherry picked from commit e01e6f24)
Signed-off-by: Ansgar Burchardt <Ansgar.Burchardt@tu-dresden.de>

dune.module

 Module: dune-uggrid
 Version: 2.5.1-git
 Depends: dune-common (>= 2.5.0)
-Maintainer: dune-devel@dune-project.org
+Maintainer: dune-devel@lists.dune-project.org
 Whitespace-Hook: Yes