Updates following PR review.

Fix tests by moving constants out of Coordinator (as it is only part of the Riot target).

RiotSwiftUI/Modules/Common/Theme/Themes/DarkThemeSwiftUI.swift

@@ -20,6 +20,7 @@ import DesignKit
 @available(iOS 14.0, *)
 struct DarkThemeSwiftUI: ThemeSwiftUI {
     var identifier: ThemeIdentifier = .dark
+    let isDark: Bool = true
     var colors: ColorSwiftUI = DarkColors.swiftUI
     var fonts: FontSwiftUI = FontSwiftUI(values: ElementFonts())
 }