Cleanup: redundant check for shader type

Pull Request: https://projects.blender.org/blender/blender/pulls/143784

scripts/startup/bl_ui/space_node.py

@@ -99,9 +99,6 @@ class NODE_HT_header(Header):
 
                 if snode_id:
                     row = layout.row()
-                    if snode.shader_type != 'WORLD':
-                        row.prop(snode_id, "use_nodes")
-
                     if world and world.use_eevee_finite_volume:
                         row.operator("world.convert_volume_to_mesh", emboss=False, icon='WORLD', text="Convert Volume")