...recently introduced with c75a46fb "fdo#46808,
use DialogProvider service constructor."  The general theme of this additional
ctor appears to be more about "Scripting" than "Listener," and the DialogLib
argument is actually expected to be of XNameContainer type.

Change-Id: Iea7d906d9b2ffc3b3ee5b2cbfaf7c58191037c9b