Ikea Lack - 3D Printer Enclosure: Top Corners Improved

I was building the Ikea Lack table derived [Original Prusa i3 MK3 ENCLOSURE](https://www.thingiverse.com/thing:2864118) and found the top corner brackets were not as strong as they could be. The legs attach to the bracket with screws on the side of the leg. As a result, the legs are very wobbly and prone to breaking off with even the slightest pressure due to the leverage the legs have on the bracket.

I modified the design to have a wider hole in the bracket so the original Ikea Lack table le