LibGUI: Remove unused header includes

Author: https://github.com/bgianfo
Commit: 8623cec0d7
Pull-request: https://github.com/SerenityOS/serenity/pull/9120
Reviewed-by: https://github.com/AtkinsSJ ✅

Userland/Libraries/LibGUI/AbstractTableView.cpp

@@ -4,7 +4,6 @@
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
-#include <AK/StringBuilder.h>
 #include <AK/Vector.h>
 #include <LibGUI/AbstractTableView.h>
 #include <LibGUI/Action.h>
@@ -13,7 +12,6 @@
 #include <LibGUI/Menu.h>
 #include <LibGUI/Model.h>
 #include <LibGUI/Painter.h>
-#include <LibGUI/Scrollbar.h>
 #include <LibGUI/Window.h>
 #include <LibGfx/Palette.h>