bug: alpha-shiny prim vertex-shaded light inconsistency

Steps to reproduce the bug: Create a transparent, shiny prim and make it a light.

Observed results: With vert shaders on, the prim is barely noticeable, even in complete darkness. However, disable vert shaders and the prim lights up. Transparent prims (no shine) don't reflect light with vert shaders on as much as they do with vert shaders off.

Expected results: While shiny alpha prims are limited to vert shaders, they should be lit similarly to just alpha prims WITHOUT vert shaders because such prims just look too differently with/without vert shaders on.