Cleanup: remove use_normals arugment to MOD_deform_mesh_eval_get

Accessing the normals creates them on demand so there was no need
to pass an argument requesting them.

source/blender/modifiers/intern/MOD_util.c

@@ -169,7 +169,6 @@ Mesh *MOD_deform_mesh_eval_get(Object *ob,
                                Mesh *mesh,
                                const float (*vertexCos)[3],
                                const int verts_num,
-                               const bool use_normals,
                                const bool use_orco)
 {
   if (mesh != NULL) {
@@ -217,14 +216,6 @@ Mesh *MOD_deform_mesh_eval_get(Object *ob,
     }
   }
 
-  /* TODO: Remove this "use_normals" argument, since the caller should retrieve normals afterwards
-   * if necessary. */
-  if (use_normals) {
-    if (LIKELY(mesh)) {
-      BKE_mesh_vertex_normals_ensure(mesh);
-    }
-  }
-
   if (mesh && mesh->runtime.wrapper_type == ME_WRAPPER_TYPE_MDATA) {
     BLI_assert(mesh->totvert == verts_num);
   }