Revert "Update the dragbar when the titlebar content size changes (#4845

)"

This reverts commit 62e424f.

src/cascadia/WindowsTerminal/NonClientIslandWindow.cpp

@@ -112,16 +112,6 @@ void NonClientIslandWindow::SetContent(winrt::Windows::UI::Xaml::UIElement conte
 void NonClientIslandWindow::SetTitlebarContent(winrt::Windows::UI::Xaml::UIElement content)
 {
     _titlebar.Content(content);
-
-    // GH#4288 - add a SizeChanged handler to this content. It's possible that
-    // this element's size will change after the dragbar's. When that happens,
-    // the drag bar won't send another SizeChanged event, because the dragbar's
-    // _size_ didn't change, only it's position.
-    const auto fwe = content.try_as<winrt::Windows::UI::Xaml::FrameworkElement>();
-    if (fwe)
-    {
-        fwe.SizeChanged({ this, &NonClientIslandWindow::_OnDragBarSizeChanged });
-    }
 }
 
 // Method Description: