[DF] Display: treat chars arrays as strings, not collections
[DF] Display: treat chars arrays as strings, not collections

This fixes ROOT-10891.

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