Reuse delay() function as global macro

Passepartout-iOS/Global/Macros.swift

@@ -61,3 +61,9 @@ extension UIColor {
         self.init(red: r, green: g, blue: b, alpha: alpha)
     }
 }
+
+func delay(_ block: @escaping () -> Void) {
+    DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(500)) {
+        block()
+    }
+}

Passepartout-iOS/Scenes/ServiceViewController.swift

@@ -273,7 +273,7 @@ class ServiceViewController: UIViewController, StrongTableHost {
                 guard error == nil else {
 
                     // XXX: delay to avoid weird toggle state
-                    DispatchQueue.main.asyncAfter(deadline: .now() + .milliseconds(500)) {
+                    delay {
                         cell.setOn(false, animated: true)
                         if error as? ApplicationError == .externalResources {
                             self.requireDownload()