Reset default values to compat_{backspace,delete} dconf
        keys. The default values are retrivied from the guake.schemas
        file.

def on_reset_compat_defaults_clicked(self, bnt):
        """Reset default values to compat_{backspace,delete} dconf
        keys. The default values are retrivied from the guake.schemas
        file.
        """
        self.settings.general.reset('compat-backspace')
        self.settings.general.reset('compat-delete')
        self.reload_erase_combos()