Actually test against form ignored (partial) diffs
Actually test against form ignored (partial) diffs

This fixes a bug in the test that existed since long ago: there were no partial diffs for "XFormInstance" because they're all in "XFormInstance*"

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