sw content control: fix lost properties on copy&paste
E.g. a checkbox content control was turned into a rich text one on
copy&paste, so toggling didn't work on the copied content control.
(cherry picked from commit
c804c5354855188b5a37219cfe11dc079dc235f4)
Change-Id: Ia7262e0b88dff12a2f87acd7b0e6cc3fbde3c3a8
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/148836
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Tested-by: Justin Luth <jluth@mail.com>
Reviewed-by: Justin Luth <jluth@mail.com>
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>