Houdini: fix default render product name in Vray

[antirotor]

Changelog Description

This is fixing key name for default render products in VRay. Original name RGB Color caused issues during job submission.

Additional info

Fixing error like:

ayon_api.exceptions.GraphQlQueryFailed: GraphQl query Failed: Name 'render_ropMainRGB Color' does not match regex '^[a-zA-Z0-9]([a-zA-Z0-9.-]*[a-zA-Z0-9])?$' on item 'project/products' (Line 3 Column 5)

Testing notes:

1. Run Houdini with Vray for Houdini
2. Create VRay ROP and publish

[MustafaJafar]

I don't have V-Ray to test it.
but changes in code matches the reported problem and suggested solution in discord.

[moonyuet]

Tested in Legacy OP looks good.

Tested in AYON, and it publishes successfully and render well.

[mkolar]

@antirotor any reason this wasn't yet merged?

[MustafaJafar]

This PR has been ported to Ayon ynput/ayon-core#117