Update default product type for the VDB cache simple creator

[BigRoy]

Changelog Description

The 'vdbcache' product type is used for product types filtering currently for Houdini and Maya based loaders so is a way more sensible default.

Additional info

I don't know of any loader that would work with the vdb product type currently.

Testing notes:

1. Publish VDB via tray publisher
2. Should be able to load it into Maya and Houdini

[BigRoy]

@iLLiCiTiT another approach would be to remove the filtering on the loaders and just filter by extension instead. However, it'd still make the tray publisher product type differ from the maya and houdini published vdbs so I think this 'fix' here may be more suitable?

[moonyuet]

Published and loaded successfully

[iLLiCiTiT]

@iLLiCiTiT another approach would be to remove the filtering on the loaders and just filter by extension instead. However, it'd still make the tray publisher product type differ from the maya and houdini published vdbs so I think this 'fix' here may be more suitable?

I even didn't know we have vdb here (I don't know what vdb is).

[BigRoy]

Stupid me - I thought your screenshot was the publisher inside Houdini, but it actually is the tray publisher.
@moonyuet Could you just approve again? :)