`using-intake-catalog.ipynb` needs to specify `storage_options` for `to_dataset_dict`

[smartlixx]

In using-intake-catalog.ipynb, we need to specify storage_options for to_dataset_dict, in addition to the zarr__kwargs. Otherwise, an 'Access denied' error will appear. In the other notebook kay-et-al-2015.v3.ipynb, this option is specified in one call but and missing in the other call.