remove filter creation function
remove filter creation function

This function was used to re-install the filter if the ethereum node
went offline. It was decided a few iterations back to move out from this
model, were the Raiden node stays running and recover from external
system unavailability, to a crash-only system (introduced by
9cb9af21c2906e5bd0515f48fbe9229195dc690a)

hackaugusto/raiden,hackaugusto/raiden