Two Trees Sapphire S - Z endstop mount

A direct replacement for the Z endstop stop mount.

Mine was touching the belts so I had to replace it.
Also it allows to put on/off without demounting the top plate.

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List of my Sapphire S modifications:
- E3D V6, BLTouch adjustable mount: https://www.thingiverse.com/thing:3775330
- E3D V6 mount: https://www.thingiverse.com/thing:3714216
- XY motors mount: https://www.thingiverse.com/thing:3689256
- stock hotend mount: https://www.thingiverse.com/thing:3674354
- ex