K8200/3Drag End Stops upgrade

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The end stops for X and Y axis are difficult to adjust as they tend to get loose when unscrewed.

The original two screw construction is complicated and I made this simpler "one screw" replacement for the axis.
There is no need for precise fine tuning of the X and Y end stops - I think this is a sufficient solution.

The original M4 screws can be reused or be replaced by shorter ones.