Added default columns

builder/dkrz_palmod_disk.py

esm-collections/disk-access/dkrz_cmip5_archive.json

esm-collections/disk-access/dkrz_cmip5_disk.json

esm-collections/disk-access/dkrz_cmip6_cloud.json

esm-collections/disk-access/dkrz_cmip6_disk.json

esm-collections/disk-access/dkrz_cordex_disk.json

esm-collections/disk-access/dkrz_era5_disk.json

esm-collections/disk-access/dkrz_palmod2_disk.json