Update product type vdb to vdbcache name for icon

[BigRoy]

Description of changes

I'm pretty sure that VDBs published from Houdini and Maya do not show the relevant vdb icon because the product type is vdbcache and not vdb. So this refactors the hardcoded icon to match vdbcache name.

I did not test this. :)

Technical details

Also see: ynput/ayon-traypublisher#13

Additional context

No idea whether changing this may affect anything else.

[BigRoy]

Here's an example of the issue actually.

The maya and houdini publishers (and loaders) use vdbcache which currently do not display in the frontend with an icon. With ynput/ayon-traypublisher#13 the traypublisher would also publsh it as vdbcache so that the product type is the same everywhere - making this new icon name the right default.

Meaning that in this example above, where vdbMain and vdbTest (considered to be the wrong product type vdb) would then display the default box icon but vdbcacheMain would display the fire.

🔥

[Innders]

I can't say I have ever seen the "local fire department" icon anywhere so far so probably safe to change.

If someone complains we can add it back.

Thanks @BigRoy 😊