[SimpleUI] UIResolutionScale is not reliable for scaling non-16:9 aspect ratios

[Flintlocket]

Oops turns out I had HUD scaling off which made SimpleUI components look out of place (fonts were being scaled up but widgets were not).

The font size issue is probably because the font template uses width instead of height.

local size = screen_w / 100

Idk if this is worth changing.

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SimpleUI position and size values are scaled like so:

The issue is that UIResolutionScale returns a single value and assumes the screen is 16:9.

A friend and I have non-standard aspects (21:9, 32:9) - wider than 1080p but the same height. The result is that the scaling is wrong. For example, on 3840x1080, UIResolutionScale returns 2, which is correct for width but not for height.

This can be resolved by calculating scale as two values