LibGfx: Intersect the bounding box with the main rect in draw_text

Without this, the bounding rect for the text as generated by TextLayout
can go beyond the bounds of the user-supplied drawing rect and cause the
text to overlap because of the line_rect.intersect(rect) a few lines
below.

Userland/Libraries/LibGfx/Painter.cpp

@@ -1471,6 +1471,8 @@ void Painter::do_draw_text(IntRect const& rect, Utf8View const& text, Font const
         VERIFY_NOT_REACHED();
     }
 
+    bounding_rect.intersect(rect);
+
     for (size_t i = 0; i < lines.size(); ++i) {
         auto line = Utf8View { lines[i] };