build: Aoo_trunk 1376366

Reproduce steps:
1. Launch AOO Impress
2. Create one slide
3. Input several paragraphs
4. Apply numbering to them, such as 1,2,3,4,5
5. Down the second paragraph to second level, now the numbering for the third paragraph is "2"
6. undo

expected result:
numbering of the third paragraph should change back to "3"

actual result:
numbering of the third paragraph is still "2". Now both the second and the third paragraph are numbered as "2"