LibGUI: Set vertical distance between icons relative to scroll value

When calculating the vertical distance between icons, we should take
into account the value of the vertical scrollbar.

Fixes SerenityOS#4040

Libraries/LibGUI/IconView.cpp

@@ -524,7 +524,7 @@ void IconView::paint_event(PaintEvent& event)
  auto font = font_for_index(item_data.index);
 
  Gfx::IntRect text_rect = item_data.text_rect;
- auto icon_translation = translation.y() - 12;
+ auto icon_translation = translation.y() + vertical_scrollbar().value() - 12;
  text_rect.set_height(text_rect.height() > icon_translation ? icon_translation : text_rect.height());
 
  painter.fill_rect(text_rect, background_color);