LibPDF: Use draw_rect() to show debug clipping rects

Using the path rasterizer here is much slower than simply drawing four
lines. This also more accurately shows the (real) clip as the bounding
box is truncated to an int before adding it as a clip rect.

Fixes #23056

Userland/Libraries/LibPDF/Renderer.cpp

@@ -305,12 +305,12 @@ RENDERER_HANDLER(path_append_rect)
 
 void Renderer::activate_clip()
 {
-    auto bounding_box = state().clipping_paths.current.bounding_box();
+    auto bounding_box = state().clipping_paths.current.bounding_box().to_type<int>();
     m_painter.clear_clip_rect();
     if (m_rendering_preferences.show_clipping_paths) {
-        m_painter.stroke_path(rect_path(bounding_box), Color::Black, 1);
+        m_painter.draw_rect(bounding_box, Color::Black);
     }
-    m_painter.add_clip_rect(bounding_box.to_type<int>());
+    m_painter.add_clip_rect(bounding_box);
 }
 
 void Renderer::deactivate_clip()