make all calls to back_to_main explicit and remove unused params
make all calls to back_to_main explicit and remove unused params

SEL-Columbia/commcare-hq,puttarajubr/commcare-hq,gmimano/commcaretest,dimagi/commcare-hq,dimagi/commcare-hq,qedsoftware/commcare-hq,dimagi/commcare-hq,qedsoftware/commcare-hq,SEL-Columbia/commcare-hq,dimagi/commcare-hq,qedsoftware/commcare-hq,gmimano/commcaretest,dimagi/commcare-hq,puttarajubr/commcare-hq,puttarajubr/commcare-hq,qedsoftware/commcare-hq,puttarajubr/commcare-hq,gmimano/commcaretest,SEL-Columbia/commcare-hq,qedsoftware/commcare-hq