pybind11: Density::generate signature has changed, default values
pybind11: Density::generate signature has changed, default values

set proper default values, as used in DFT_ground_state class

electronic-structure/sirius,electronic-structure/sirius,electronic-structure/sirius,toxa81/sirius,electronic-structure/sirius,toxa81/sirius,electronic-structure/sirius,electronic-structure/sirius,toxa81/sirius,electronic-structure/sirius,toxa81/sirius,toxa81/sirius,toxa81/sirius