and page reorder remove and re-inserts the slide in the slide sorter, so the
selected page property is removed when the page doesn't really get removed. So
then there's no selection to apply the later master page property to.

Change-Id: I4a32958542da1bf2f5041dde0294a772645e30ad
Reviewed-on: https://gerrit.libreoffice.org/54126Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>