Remove hardcoded runscript cmd to use current one
Remove hardcoded runscript cmd to use current one

This was a copy/paste of an old version of the django-extensions
command, I'd rather use the library one which is kept up-to-date

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