Switch the 4x2 grid with a 2x4 grid for the Eights windows calculation in portrait mode

[joaquin-splunk]

• This is a new bug that hasn't been documented in a closed issue or in the Readme.

macOS version: 15.1.1 (24B91)
Rectangle version: 3.0.37 (178) (Pro version)
Logs if applicable (In Rectangle menu, hold option, "View Logging..."): N/A

When doing the window calculations for most of the "eights" (BottomLeftEighthCalculation being the exception) in portrait mode, it divides the screen by a 4x2 grid. I expected that on portrait mode the grid would switch to 2x4 instead.

Thank you for your time 🙇🏼