[DF] Always copy from TTreeReaderArray<bool> into RVec<bool>
[DF] Always copy from TTreeReaderArray<bool> into RVec<bool>

We can never adopt memory in this case. See inline comments for more context.
Fixes the _reading_ part of ROOT-9666.

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