Fix unfocus

Author: valentinbreiz

SRC/Aura_OS/Properties/VersionInfo.cs

@@ -2,6 +2,6 @@ namespace Aura_OS
 {
     public class VersionInfo
     {
-        public static string revision = "280620231447";
+        public static string revision = "280620231450";
     }
 }

SRC/Aura_OS/System/Application/App.cs

@@ -69,7 +69,10 @@ public override void Update()
 
                     if (!HasWindowMoving && Window.Close.IsInside((int)MouseManager.X, (int)MouseManager.Y))
                     {
-                        Kernel.WindowManager.Focused = null;
+                        if (Kernel.WindowManager.Focused == this)
+                        {
+                            Kernel.WindowManager.Focused = null;
+                        }
                         Stop();
                         return;
                     }