Change mp_obj_type_t.name from const char * to qstr.

Ultimately all static strings should be qstr.  This entry in the type
structure is only used for printing error messages (to tell the type of
the bad argument), and printing objects that don't supply a .print method.

py/objmodule.c

@@ -39,7 +39,7 @@ STATIC bool module_store_attr(mp_obj_t self_in, qstr attr, mp_obj_t value) {
 
 const mp_obj_type_t module_type = {
     { &mp_const_type },
-    "module",
+    .name = MP_QSTR_module,
     .print = module_print,
     .load_attr = module_load_attr,
     .store_attr = module_store_attr,