Problem is that the TextBox SwFrmFmt of a draw object gets a FLY_AS_CHAR
anchor set, which is then not updated later before nodes are deleted.

(regression from c7307c77)

(cherry picked from commit 9dbb88fc)

Change-Id: I906ee47b5c30944a08fd8a0d7d6ea8b8c9e6a6a8
Reviewed-on: https://gerrit.libreoffice.org/17580Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>