Error converting non-ASCII filename to string
Error converting non-ASCII filename to string

ZipFile.write accepts Unicode filenames, so don't bother converting to string.

This is to fix bug [FB 161535](http://manage.dimagi.com/default.asp?161535)

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