Removed ng_maxlength directives
Removed ng_maxlength directives

These aren't needed because maxlength is already enforced via HTML,
either in this code or when the fields are created at the top of
NewMobileWorkerForm.

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