Calling directly causes freezes in Execute() when instantiating
dialogs.

Change-Id: I3aa09b99e5a13027892aeba02860e87e29b172da
Reviewed-on: https://gerrit.libreoffice.org/50419Reviewed-by: Marco Cecchetti <mrcekets@gmail.com>
Tested-by: Marco Cecchetti <mrcekets@gmail.com>
Reviewed-on: https://gerrit.libreoffice.org/50483Tested-by: Jenkins <ci@libreoffice.org>