Fix two more cases of a missing super().__init__() in the model init

[EwoutH]

Fixes two more cases of a missing super().init() in the model init. Should resolve two of the errors in projectmesa/mesa#1942.

class MyModel(mesa.Model):
    def __init__(self):
        super().__init__()  # This is required!

This is needed to correctly add Agents to the model and setup other Mesa model variables.

[EwoutH]

Please squash on merging