m-lua-scripting: impl_module_new(): fix property list memory leak

The `properties` argument of `wp_impl_module_load()` is marked
"transfer none", thus the caller's reference remains valid and
must be disposed of.

Fixes: ef29018c55 ("m-lua-scripting: Add WpImplModule bindings")

modules/module-lua-scripting/api/api.c

@@ -1691,7 +1691,7 @@ static int
 impl_module_new (lua_State *L)
 {
   const char *name, *args = NULL;
-  WpProperties *properties = NULL;
+  g_autoptr (WpProperties) properties = NULL;
 
   name = luaL_checkstring (L, 1);