fix typo in model migration
fix typo in model migration

spendb/spendb,spendb/spendb,johnjohndoe/spendb,openspending/spendb,spendb/spendb,pudo/spendb,CivicVision/datahub,pudo/spendb,pudo/spendb,johnjohndoe/spendb,openspending/spendb,johnjohndoe/spendb,CivicVision/datahub,CivicVision/datahub,openspending/spendb