jsdialog: fix missing update for "treeview" action "select"

When Treeview control selects an item, the state of the control
has changed and it should update the new changes to the client side.

Change-Id: I27d6a215148fcef260799d76ffe209460f38c559
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/111355
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Szymon Kłos <szymon.klos@collabora.com>
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/113683
Tested-by: Jenkins
Reviewed-by: Henry Castro <hcastro@collabora.com>

vcl/jsdialog/jsdialogbuilder.cxx

@@ -1121,6 +1121,7 @@ void JSTreeView::select(int pos)
         }
     }
     enable_notify_events();
+    sendUpdate();
 }
 
 weld::TreeView* JSTreeView::get_drag_source() const { return g_DragSource; }