Model Renderer: Ignore mobj full-bright flag with GL2 models

We want for the model itself to use emissive maps etc. to make
appropriate parts bright, rather than assuming the entire model has
maximum ambient light from all directions.

doomsday/apps/client/src/render/r_things.cpp

@@ -443,7 +443,8 @@ void R_ProjectSprite(mobj_t &mob)
         Vector4f ambientColor;
         duint vLightListIdx = 0;
         evaluateLighting(vis->pose.origin, subspace, vis->pose.distance,
-                         fullbright, ambientColor, &vLightListIdx);
+                         fullbright && !animator, // GL2 models lit with more granularity
+                         ambientColor, &vLightListIdx);
 
         // Apply uniform alpha (overwritting intensity factor).
         ambientColor.w = alpha;