MP Select Mini X Gantry Support Modified

I really liked the [original thing](https://www.thingiverse.com/thing:1864625) and wanted to implement it on my printer since the X axis arm had very noticeable sag. I was having trouble fitting and printing the original so I decided to trim it down a little bit. I also needed a notch for the "no drill" bed wiring side panel.

So here's the result, a gantry support for the Mini Select that reliably prints on a mini with no changes to printer settings (the model may need to be rotated), has reduced mass, and supports the [MPSM Side Cooling Vent Remix for No Drill Bed Rewiring](https://www.thingiverse.com/thing:2451362) thing. You'll still need the the original [thing](https://www.thingiverse.com/thing:1864625) files as this is a modification to the brace only.

I was sure to not remove any material that would compromise the strength or structural integrity and it works great. It's exactly what I needed to fix my angled bed level.