[RF] Enable again the RooJSONFactoryWSTool Python tests on Mac
[RF] Enable again the RooJSONFactoryWSTool Python tests on Mac

The tests should be fixed now by the previous commits.

olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root