Flip half of the top plate layer

[frostspanner]

For plastic cases I assume it doesn't matter, but I used the top layer file to get steel plates cut. Since the plates were only finished on one side they weren't reversible and the screw holes are going to be in the wrong spot for one half of the keyboard.

[nooges]

Ah yes, I had the same issue with the Nyquist when I did the first run of stainless steel plates, didn't realize the back side would be rough and unsuitable for flipping. I'll get some revised files up this week.

[tianweiliu]

Hi all! I made a pull request adding files with half of the plates flipped. #3