sw: remove unused zorder data from bugdocs

Expecting that the shapes are on the drawpage in the same order as they
are in the file and providing zorder info at the same time doesn't work.
Either using names is required or the simpler way is not providing
zorder info. Fixed earlier bugdocs not to provide zorder info, so when
zorder will be handled, these tests will still work.

Change-Id: I771b0574eba489322998c84a60d5acb94fd09189
DOCX drawingml shape import: handle name and z-order

Change-Id: Ib4e17723ba9e2bb4dae0eb86cf55513a4b68de6f