Bandcamp importer uses modified date as release date

[bdb484]

I've been getting lots of wrong dates when importing albums from Bandcamp, and I just today figured out that it's apparently grabbing the date that an album was most recently modified on Bandcamp and using that as the release date.

Here's the page were I most recently encountered the issue: https://konono1.bandcamp.com/album/congotronics

[taylorthurlow]

FWIW I just used the script for https://hellometeor.bandcamp.com/album/baish-caplan, which at the time of writing has a release date of 2024-09-22, and a last-modified date of 2024-11-25, and the script correctly used the September release date when filling the MB form.