[jak2] misc fixes to renderers (#2488)

Fixes decal on tfrag:

![image](https://user-images.githubusercontent.com/48171810/232174352-11153941-e1f9-4472-becb-f266c2a309e5.png)

Sets up jak 2 alpha shrub test settings. They are still too dark, but
there's no longer incorrect alpha test:

![image](https://user-images.githubusercontent.com/48171810/232174590-f9caa6c5-f190-4c78-b720-5f4055490d47.png)

Fix decal on shrub, a feature used in exactly one place in jak 1:

![image](https://user-images.githubusercontent.com/48171810/232174614-8ea65ca5-a183-45f7-ae79-6bf06a937007.png)

Fixed issue with u16 overflow in castle on the alpha channel, causing
flickering. It barely overflowed, which made me suspicious that we had
some error somewhere. But I think that there code is robust against
overflows.

decompiler/level_extractor/extract_level.cpp

@@ -197,7 +197,7 @@ std::vector<level_tools::TextureRemap> extract_bsp_from_level(const ObjectFileDB
           dynamic_cast<level_tools::shrub_types::DrawableTreeInstanceShrub*>(draw_tree.get());
       ASSERT(as_shrub_tree);
       extract_shrub(as_shrub_tree, fmt::format("{}-{}-shrub", dgo_name, i++),
-                    bsp_header.texture_remap_table, tex_db, {}, level_data, false);
+                    bsp_header.texture_remap_table, tex_db, {}, level_data, false, db.version());
     } else if (draw_tree->my_type() == "drawable-tree-collide-fragment" && extract_collision) {
       auto as_collide_frags =
           dynamic_cast<level_tools::DrawableTreeCollideFragment*>(draw_tree.get());