switcheroo shim incorrectly populates `Discrete` key

[Jan200101]

cardwire/crates/cardwire-daemon/src/interface/switcheroo.rs

Lines 56 to 59 in 23dd0ac

	// "Default" (b)
	dict.insert("Default", OwnedValue::from(gpu.device.is_default()));
	// "Discrete" (b)
	dict.insert("Discrete", OwnedValue::from(!gpu.device.is_default()));

The Discrete key is incorrectly populated with !default instead of properly checking if a given device is discrete or not.

[trbocode]

A similar incorrect check is in L47

[Jan200101]

There are lots more places that expect default => integrated and non-default => discrete, I just wanted to point out the one that causes Desktop Environments like KDE to do the wrong thing and make ValveSoftware/steam-for-linux#9940 happen again

[luytan]

alr fixed on a local branch, i'm trying to improve the discrete GPU detection before i push it, it's quite messy rn