update data_filename fields - to match new file naming patterns
update data_filename fields - to match new file naming patterns

onursumer/cbioportal,onursumer/cbioportal,onursumer/cbioportal,cBioPortal/cbioportal,cBioPortal/cbioportal,sheridancbio/cbioportal,n1zea144/cbioportal,sheridancbio/cbioportal,n1zea144/cbioportal,cBioPortal/cbioportal,onursumer/cbioportal,n1zea144/cbioportal,n1zea144/cbioportal,cBioPortal/cbioportal,onursumer/cbioportal,sheridancbio/cbioportal,n1zea144/cbioportal,cBioPortal/cbioportal,n1zea144/cbioportal,onursumer/cbioportal,cBioPortal/cbioportal,sheridancbio/cbioportal,n1zea144/cbioportal,sheridancbio/cbioportal,sheridancbio/cbioportal