LibWeb: Remove done gradient painting TODO

This code is already generalised to every gradient in existence.

Userland/Libraries/LibWeb/Painting/GradientPainting.cpp

@@ -71,7 +71,6 @@ static ColorStopData resolve_color_stop_positions(auto const& color_stop_list, a
         max_previous_color_stop_or_hint = value;
         return value;
     };
-    // Move this step somewhere generic (since I think this code can be mostly reused for conic gradients)
     size_t resolved_index = 0;
     for (auto& stop : color_stop_list) {
         if (stop.transition_hint.has_value())