Remove a confusing comment about the ordering of fields within RendererVk
Remove a confusing comment about the ordering of fields within RendererVk

The comment divides fields set up in the constructor from fields set up later
in the Vulkan renderer's initialisation (currently the application needs to do
some work between construction and finishing initialisation.)  The field
ordering should probably be reviewed at some point, and then this comment
could be reinstated.

StrayLightning/wyvern