Fix off-by-one error in cluster calc in TTree::Fill.
Fix off-by-one error in cluster calc in TTree::Fill.

When the TTree already had more than one cluster range, the boundary calculation for the new
cluster in TTree::Fill was off by one.

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