LibWeb: Fix crash from text inside SVG

Author: https://github.com/Psychpsyo
Commit: 801499f13e
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/2381
Reviewed-by: https://github.com/kalenikaliaksandr
Reviewed-by: https://github.com/shlyakpavel

Libraries/LibWeb/Painting/SVGSVGPaintable.cpp

@@ -100,8 +100,8 @@ void SVGSVGPaintable::paint_descendants(PaintContext& context, PaintableBox cons
     };
 
     paintable.before_children_paint(context, PaintPhase::Foreground);
-    paintable.for_each_child([&](auto& child) {
-        paint_svg_box(verify_cast<PaintableBox>(child));
+    paintable.for_each_child_of_type<PaintableBox>([&](PaintableBox& child) {
+        paint_svg_box(child);
         return IterationDecision::Continue;
     });
     paintable.after_children_paint(context, PaintPhase::Foreground);