update schema generation to use correct case property path
update schema generation to use correct case property path

Case path are never nested within the case block. As far as I can tell
this has been incorrect since it was first implemented but never noticed
as it's an uncommon edge case.

dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq,dimagi/commcare-hq