tdf#137802 sw: fix crash of textbox anchored to page

This is a regression from commit
a7bd634371285dbdceaf775dc31b6b586c7ca02f
(tdf#137802 tdf#84691 sw: sync anchoring of
textbox with UNO), where synching didn't
remove the anchoring setting.

Steps for reproducing:

1. In an empty document add a new paragraph so that you have two.
2. Insert – Shape – Basic Shapes – Rectangle and place it to the
center of page to have it anchored to the second empty paragraph.
3. Right click on the shape – Add Text Box
4. Right click on the shape – Position and Size
5. Set Anchor as To page
6. Delete the second paragraph that the shape was anchored
7. Click on the shape and press Delete

Change-Id: I67f076bb9fc26cf47185aa21a84371dd85c6e3ea
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/106531
Tested-by: László Németh <nemeth@numbertext.org>
Reviewed-by: László Németh <nemeth@numbertext.org>

0 files changed, 0 insertions, 0 deletions