[RF] Don't try to un-do modifications to the compute graph in BatchMode
It's to expensive to do for large graphs, too complicated to implement, an not necessary anymore because also in BatchMode the full computation graph is cloned. This also means that the `RooAbsReal` that is evaluated in `RooAbsReal::getValues()` also needs to be cloned, but this is okay because the interface is so far only used in unit tests and not performance critical. It was actually necessary to do the cloning there to begin with, since the BatchMode was not correctly reverting all modifications to the computation graph anyway.
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