[RF][NFC] Fix indentation/clean up RooAbsOptTestStatistic ...
[RF][NFC] Fix indentation/clean up RooAbsOptTestStatistic ...

... and remove a useless instruction.

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