fix tz migration decorator
fix tz migration decorator

https://github.com/dimagi/commcare-hq/commit/fbb9075eac1fbf7004f6b94f3eb250f6e6c77ec0#diff-2ef5f5700dc8a80f94dd81990d3b340c

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