Fixes for multi-window support. (#5528)

* Correctly handle the re-opening of the main window.

Add an additional safe-guard to ensure only one main window exists.
Make sure all secondary windows use the correct tint colour.

* Fix a bug where the settings screen isn't shown on macOS when the AppLock feature is enabled.

ElementX/Sources/Application/Application.swift

@@ -32,7 +32,7 @@ struct Application: App {
     }
 
     var body: some Scene {
-        WindowGroup {
+        WindowGroup(id: SceneDelegate.mainSceneID) {
             appCoordinator.toPresentable()
                 .statusBarHidden(shouldHideStatusBar)
                 .overlay(alignment: .top) {
@@ -52,7 +52,7 @@ struct Application: App {
                 }
                 .task {
                     appCoordinator.start()
-                    appCoordinator.windowManager.configure(withOpenWinddowAction: openWindow,
+                    appCoordinator.windowManager.configure(withOpenWindowAction: openWindow,
                                                            dismissWindowAction: dismissWindow)
                 }
         }