[DF][NFC] Use colName instead of branchName where appropriate
[DF][NFC] Use colName instead of branchName where appropriate

I.e. where we are talking about generic RDF columns, not TTree branches.

olifre/root,olifre/root,root-mirror/root,root-mirror/root,karies/root,root-mirror/root,root-mirror/root,karies/root,olifre/root,olifre/root,olifre/root,root-mirror/root,karies/root,karies/root,karies/root,karies/root,olifre/root,olifre/root,karies/root,olifre/root,root-mirror/root,olifre/root,karies/root,olifre/root,karies/root,karies/root,root-mirror/root,root-mirror/root,root-mirror/root,karies/root,olifre/root,root-mirror/root,root-mirror/root