Remove `render` prop for tengine config

[ebebbington]

as far as im aware, the user doesn't even need to define it, tengine can, because it's signature never changes

Why dont we remove it from the configs and just set it from within tengine? no watter what, it will **always be **render: (..args: unknown[]) => false, so seems pointless for users to define it when they cant even change it if they wanted to

[ebebbington]

closing, it is actually used