[TTreeReader] Make ESetupStatus values non-ambiguous
[TTreeReader] Make ESetupStatus values non-ambiguous

TTreeReaderValueBase::ESetupStatus contained two enumerators with value -7
and two with value 0. In both cases, one of the ambiguous enumerators was
actually unused, and it was changed to have an unambiguous value.

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