[mod-mall] Remember Me ticked by default

[Tiểu Bá Vương 1404]

I have adjusted the code so it should work on all current 4.x.x releases. It is now also a product, which you can turn on and off through the admincp.

To Install

Install XML
Configure mod

To Uninstall

Uninstall XML

You can also turn the footer link off through admincp.