Fix launcher on browser (#16271)

* Fix browser launcher impl

* Use globalThis just in case
#Conflicts:
#	src/Browser/Avalonia.Browser/Interop/NavigationHelper.cs

src/Browser/Avalonia.Browser/BrowserTopLevelImpl.cs

@@ -175,6 +175,11 @@ namespace Avalonia.Browser
                 return _inputPane;
             }
 
+            if (featureType == typeof(ILauncher))
+            {
+                return new BrowserLauncher();
+            }
+
             return null;
         }
     }

src/Browser/Avalonia.Browser/Interop/NavigationHelper.cs

@@ -8,6 +8,6 @@ internal static partial class NavigationHelper
     [JSImport("NavigationHelper.addBackHandler", AvaloniaModule.MainModuleName)]
     public static partial void AddBackHandler([JSMarshalAs<JSType.Function<JSType.Boolean>>] Func<bool> backHandlerCallback);
 
-    [JSImport("window.open")]
+    [JSImport("globalThis.open")]
     public static partial JSObject? WindowOpen(string uri, string target);
 }