Fix handling of skinned meshes for nodes

- Rigidly animated models (e.g. the gltf frog node) were not working correctly,
  since cloning the mesh ignored the transformation matrices.
  Note that scaling the mesh needs to occur *after* transforming the vertices.
- Visual scale did not apply to skinned models,
  as resetting the animation overwrote scaled vertex data with static positions & normals.
  For backwards compatibility, we only apply a 10x scale to static (.obj) models.

src/client/content_mapblock.cpp

@@ -1676,7 +1676,7 @@ void MapblockMeshGenerator::drawMeshNode()
 
 	if (cur_node.f->mesh_ptr) {
 		// clone and rotate mesh
-		mesh = cloneMesh(cur_node.f->mesh_ptr);
+		mesh = cloneStaticMesh(cur_node.f->mesh_ptr);
 		bool modified = true;
 		if (facedir)
 			rotateMeshBy6dFacedir(mesh, facedir);