The XMLNamedBoolPropertyHdl should be owned by
OControlPropertyHandlerFactory like all the other handlers created in
that function.
Thanks to Julien Nabet for pointing out the problem.
Change-Id: Id474b2fdb84ca74f686d0c888fbedbee623c31bb
Reviewed-on: https://gerrit.libreoffice.org/52666
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>