Fix for Splatoon Nintendo Switch folding stand

I found that the sides for the folding stand made by Vex were backwards, so the excellent artwork would be hidden inside the folds when using the stand. I took those sides and reversed the artwork so when printed (along with the back in Vex's thing) everything will go together and be visible.

See the original thing (https://www.thingiverse.com/thing:2783809) for printing information. Note that supports might be needed with the reversed artwork printed on the build plate.