Update the demo to use tooltip on macOS, showing the native view coordinate

Author: dreampiggy

Example/SDWebImageSwiftUIDemo/ContentView.swift

@@ -91,11 +91,11 @@ struct ContentView: View {
                         if self.animated {
                             #if os(macOS) || os(iOS) || os(tvOS)
                             AnimatedImage(url: URL(string:url))
-                            /**
-                             .onViewUpdate { view, context in
-                                 view.toolTip = "Mouseover Tip"
-                             }
-                             */
+                            .onViewUpdate { view, context in
+                            #if os(macOS)
+                                view.toolTip = url
+                            #endif
+                            }
                             .indicator(SDWebImageActivityIndicator.medium)
                             /**
                             .placeholder(UIImage(systemName: "photo"))