Fix android launcher return values (#15601)

src/Android/Avalonia.Android/Platform/AndroidLauncher.cs

@@ -27,6 +27,7 @@ internal class AndroidLauncher : ILauncher
                 var flags = ActivityFlags.ClearTop | ActivityFlags.NewTask;
                 intent.SetFlags(flags);
                 _context.StartActivity(intent);
+                return Task.FromResult(true);
             }
         }
         return Task.FromResult(false);
@@ -49,6 +50,7 @@ internal class AndroidLauncher : ILauncher
                 var flags = ActivityFlags.ClearTop | ActivityFlags.NewTask;
                 chooserIntent.SetFlags(flags);
                 _context.StartActivity(chooserIntent);
+                return Task.FromResult(true);
             }
         }
         return Task.FromResult(false);

src/Avalonia.Controls/Platform/IInputPane.cs

@@ -12,7 +12,7 @@ namespace Avalonia.Controls.Platform
     public interface IInputPane
     {
         /// <summary>
-        /// The current input pane state
+        /// The current input pane state.
         /// </summary>
         InputPaneState State { get; }