Fixed label in SF files
This fixes a wrong assignment of the expset label that prevents filter from producing the DATA_ files witth he correct name (and prevents nnfit from finding the SF files if they're passed through the runcard). cc @wilsonmr
This fixes a wrong assignment of the expset label that prevents filter from producing the DATA_ files witth he correct name (and prevents nnfit from finding the SF files if they're passed through the runcard). cc @wilsonmr