Make the Samples runnable (fix missing init and do not use MainPage a…

…s it is based on Tabbed page)

sample/Sample/App.xaml.cs

@@ -8,7 +8,7 @@ public App()
         {
             InitializeComponent();
 
-            this.MainPage = new MainPage();
+            this.MainPage = new StandardPage();
         }
     }
 }

sample/Sample/Pages/MainPage.xaml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8" ?>
 <TabbedPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
-            xmlns:samples="clr-namespace:Samples;"
+            xmlns:samples="clr-namespace:Samples"
             x:Class="Samples.MainPage"
             Title="ACR UserDialogs">
     <TabbedPage.Children>

sample/Sample/Platforms/Android/MainApplication.cs

@@ -9,8 +9,9 @@ public class MainApplication : MauiApplication
         public MainApplication(IntPtr handle, JniHandleOwnership ownership)
             : base(handle, ownership)
         {
+            Acr.UserDialogs.UserDialogs.Init(this);
         }
 
         protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
     }
-}
+}