Fix Stat Editor randomize buttons centering

Hiding and Showing doesn't trigger an update to the FlowLayoutPanel's width; force a layout to happen so the size updates prior to re-centering controls. Only move if it is a different X coordinate (perf?)

PKHeX.WinForms/Controls/PKM Editor/StatEditor.cs

@@ -638,6 +638,8 @@ public void ToggleInterface(PKM pk, int gen)
         foreach (var mtb in MT_EVs)
             mtb.Visible = !showAV;
 
+        FLP_PKMEditors.PerformLayout();
+
         var showGV = pk is IGanbaru;
         Label_GVs.Visible = showGV;
         foreach (var mtb in MT_GVs)

PKHeX.WinForms/Util/WinFormsUtil.cs

@@ -36,7 +36,8 @@ internal static void CenterToForm(this Control child, Control? parent)
     internal static void HorizontallyCenter(this Control child, Control parent)
     {
         int midpoint = (parent.Width - child.Width) / 2;
-        child.SetBounds(midpoint, 0, 0, 0, BoundsSpecified.X);
+        if (child.Location.X != midpoint)
+            child.SetBounds(midpoint, 0, 0, 0, BoundsSpecified.X);
     }
 
     public static T? FirstFormOfType<T>() where T : Form => (T?)Application.OpenForms.Cast<Form>().FirstOrDefault(form => form is T);