Invert calculation for the "Eights" in portrait mode

[joaquin-splunk]

When I was configuring my screen that's on portrait mode with the Eights, the only one that fit my expectation was when it was on the Bottom Left corner of my screen. That's when I noticed on the code for Rectangle/WindowCalculation/BottomLeftEighthCalculation.swift the divisors are switched for the height and the width, while on the other calculations for the Eights are equal for both landscape and portrait mode.

This PR just switches them for the portrait mode for the other calculations.

[joaquin-splunk]

This is in relation to #1540

[rxhanson]

Thanks for contributing. I tested this out real quick and it looked like the eighths that go in the center spaces will have to get their origin coordinates adjusted as well?

[rxhanson]

Figured I'd check back in on this. As noted, it looked to me that we would also need the origins of each rectangle adjusted here as well. I don't mind fixing this, but didn't want to step on any toes if you were still looking to fix it.

[joaquin-splunk]

Thanks for checking in. I haven't had the time yet to look into the issue. I might take a look during this weekend or next weekend, unless you get it before then.

[rxhanson]

I went ahead and fixed the calculations, and this will go in the next release.