2020 corner bracket 28 mm light version

I made the bracket slightly thicker to also work with M4x8 mm screws but maintaining the 20mm width. Furthermore, I removed some of the material on the sides to make it lighter. I use it for a enclosure with 2020 extrusions and the rigidity is fine. In my case the enclosure is not part of the printer frame. Printed in PETG with 25% infill, 0.7 mm wall thickness, 0.24 mm layer height, and with a 0.6 mm nozzle. No support required.