Revert "fixed runtime xaml load failure"

This reverts commit f5686cc154.

src/core/Microsoft.PowerToys.Settings.UI.Runner/Program.cs

@@ -1,20 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
-
-namespace SettingsRunner
-{
-    public class Program
-    {
-        [System.STAThreadAttribute()]
-        public static void Main()
-        {
-            using (new SettingsUI.App())
-            {
-                SettingsRunner.App app = new SettingsRunner.App();
-                app.InitializeComponent();
-                app.Run();
-            }
-        }
-    }
-}