Fix typo in calling base methods.

src/Avalonia.Controls/Button.cs

@@ -187,7 +187,7 @@ namespace Avalonia.Controls
 
         protected override void OnDetachedFromLogicalTree(LogicalTreeAttachmentEventArgs e)
         {
-            base.OnAttachedToLogicalTree(e);
+            base.OnDetachedFromLogicalTree(e);
 
             if (Command != null)
             {

src/Avalonia.Controls/MenuItem.cs

@@ -298,7 +298,7 @@ namespace Avalonia.Controls
 
         protected override void OnDetachedFromLogicalTree(LogicalTreeAttachmentEventArgs e)
         {
-            base.OnAttachedToLogicalTree(e);
+            base.OnDetachedFromLogicalTree(e);
 
             if (Command != null)
             {