VisualBuilder: Tweak margins in properties window.

DevTools/VisualBuilder/VBPropertiesWindow.cpp

@@ -12,6 +12,7 @@ VBPropertiesWindow::VBPropertiesWindow()
     auto* widget = new GWidget;
     widget->set_fill_with_background_color(true);
     widget->set_layout(make<GBoxLayout>(Orientation::Vertical));
+    widget->layout()->set_margins({ 2, 2, 2, 2 });
     set_main_widget(widget);
 
     m_table_view = new GTableView(widget);