Fix form centering to non-primary screen

The first screen is configured with origin coordinates 0,0; any other screens that are arranged to the left or below will have coordinates in the negative. Negative coordinates are valid; don't sanitize.

PKHeX.WinForms/Util/WinFormsUtil.cs

@@ -27,7 +27,7 @@ internal static void CenterToForm(this Control child, Control? parent)
             return;
         int x = parent.Location.X + ((parent.Width - child.Width) / 2);
         int y = parent.Location.Y + ((parent.Height - child.Height) / 2);
-        child.Location = new Point(Math.Max(x, 0), Math.Max(y, 0));
+        child.Location = new Point(x, y);
     }
 
     /// <summary>