vk: fixup studio model zero normal printing

ref/vk/TODO.md

@@ -1,6 +1,8 @@
 ## 2024-01-19 E366
 - [x] investigate more shading nans
 	- found zero normals in studio models, see #731
+- [ ] guns and transparency
+- [ ] flashlight is too bright
 - [ ] bounce diffuse is still way darker than before
 
 # Previously

ref/vk/vk_studio.c

@@ -1723,9 +1723,9 @@ static void buildSubmodelMeshGeometry( build_submodel_mesh_t args ) {
 						g_studio_current.entmodel->studio_header->name,
 						g_studio_current.bodypart_index,
 						j, vertex_offset, j + vertex_offset, vi,
-						g_studio.norms[0],
-						g_studio.norms[1],
-						g_studio.norms[2],
+						g_studio.norms[vi][0],
+						g_studio.norms[vi][1],
+						g_studio.norms[vi][2],
 						normal_len2
 					);
 				}