[INTERNAL] fix for commit 006ef5d2e159608c1a3004554824baf715d82fcc

Commit 006ef5d2e159608c1a3004554824baf715d82fcc removed the contact
selection listener instead of changing its interface and removing the no
longer existing method.

This patch re-adds the listener again.

Change-Id: I25a3fafbd7f9f295c3b9abe09e7d9ef4d99c8063
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1764
Tested-by: Jenkins CI
Reviewed-by: Stefan Rossbach <srossbach@arcor.de>