AlfaWise U-20 Z-Axis End Stop Adjuster

This is a remix of #2725795 CR-10 / Ender-3 Z-Axis End Stop Adjustment, for AlfaWise-U20.

You need to just return or change or cut the left square to just have a "T" and not the aluminium support for original Z-stop module, or the new Z-Stop module cannot be placed.