Arch iPad 1st Generation Stand (Print Flat Edition)

This is a minor tweak to Johncoffee's [1st gen iPad arch stand](https://www.thingiverse.com/thing:1874327).

I tried to print it on its back but there is a slight curve which prevented the model from laying flat on the bad. This print corrects this error, meaning no supports, less filament, and a shorter print time.

Although my remix means that there is more shear stress place on the weak point, it appears to be sturdy and is holding up well so far.