Fix 'right' parameter type checking in CppClass.add_binary_numeric_operator.
Fix 'right' parameter type checking in CppClass.add_binary_numeric_operator.

cawka/pybindgen,caramucho/pybindgen,caramucho/pybindgen,cawka/pybindgen,caramucho/pybindgen,cawka/pybindgen,caramucho/pybindgen,cawka/pybindgen