Compile fixes for Xcode 14.3.1

[rrva]

Did not compile on Xcode 14.3.1

Cannot convert value of type '()' to expected condition type 'Bool'

[rrva]

Fixes #70

[ghost]

could you possibly just also include the implicit declaration of type as well?

let deviceSupportsQuantization: Bool = {

I've had the compiler complain when this was missing a few times as well.

Have you tested that the current code builds in 14.3.1 with the current StableDiffusion package with these changes?

[dkman94]

Had the same issue, and this fixes the problem in 14.3.1 for me as well!