Vertical box for SKR2 board & Raspberry Pi on Ender 3 v2

This is an awesome case, but I ran into a couple of slight issues:

• The orientation of the Raspberry Pi on the left-sided version makes it impossible to use the USB/Ethernet ports since the extruder bracket is very close. This remix swaps the Pi's orientation to the back.
• I also found it quite difficult to get the screws started on the original case, so I have enlarged the holes for use with threaded inserts.
• Finally, I have removed the tabs on the bottom where the case attaches to the printer frame since these interfere with the power supply on the Ender 3 v2.