fix: opening admin panel (#2185)

fixes a bug where you had to press the hot key to open the admin panel twice before it would open for the first time

Author: Mighty-Professional

Intersect.Client/Interface/Game/GameInterface.cs

@@ -155,9 +155,11 @@ public void NotifyOpenAdminWindow()
 
         public void OpenAdminWindow()
         {
-            mAdminWindow ??= new AdminWindow(GameCanvas);
-
-            if (mAdminWindow.IsVisible())
+            if (mAdminWindow == null)
+            {
+                mAdminWindow ??= new AdminWindow(GameCanvas);
+            }
+            else if (mAdminWindow.IsVisible())
             {
                 mAdminWindow.Hide();
             }