More one liners for the god of one liners

src/Avalonia.Controls/Platform/PlatformManager.cs

@@ -20,15 +20,8 @@ namespace Avalonia.Controls.Platform
         {
         }
 
-        public static ITrayIconImpl? CreateTrayIcon()
+        public static ITrayIconImpl? CreateTrayIcon() =>
-        {
+            s_designerMode ? null : AvaloniaLocator.Current.GetService<IWindowingPlatform>()?.CreateTrayIcon();
-            var platform = AvaloniaLocator.Current.GetService<IWindowingPlatform>();
-
-            if (platform == null)
-                return null;
-
-            return s_designerMode ? null : platform.CreateTrayIcon();
-        }
 
 
         public static IWindowImpl CreateWindow()