Fix copy of TF1Convolution and TF1NormSum #4138
Merged
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The copy constructor of TF1Convolution and TF1NormSum where usinog TF1::Clone for the contained TF1 pointers. TF1::Clone does not work when the TF1 objects are based on compiled functors and not formula.
Use now the correct TF1::Copy function to copy the contained objects.
This fixes the problem reported at https://root-forum.cern.ch/t/tf1convolution-zero-in-root-6-18/35421