LibWeb: Fix painting of paths with storke-width=0 in Skia painter

From SkPaint.h:
"Sets the thickness of the pen used by the paint to outline the shape.
A stroke-width of zero is treated as "hairline" width. Hairlines are
always exactly one pixel wide in device space (their thickness does not
change as the canvas is scaled)."

While we expect stroke-width=0 to simply not be painted.

Userland/Libraries/LibWeb/Painting/DisplayListPlayerSkia.cpp

@@ -698,6 +698,10 @@ CommandResult DisplayListPlayerSkia::fill_path_using_paint_style(FillPathUsingPa
 
 CommandResult DisplayListPlayerSkia::stroke_path_using_color(StrokePathUsingColor const& command)
 {
+    // Skia treats zero thickness as a special case and will draw a hairline, while we want to draw nothing.
+    if (!command.thickness)
+        return CommandResult::Continue;
+
     auto& canvas = surface().canvas();
     SkPaint paint;
     paint.setAntiAlias(true);
@@ -712,6 +716,10 @@ CommandResult DisplayListPlayerSkia::stroke_path_using_color(StrokePathUsingColo
 
 CommandResult DisplayListPlayerSkia::stroke_path_using_paint_style(StrokePathUsingPaintStyle const& command)
 {
+    // Skia treats zero thickness as a special case and will draw a hairline, while we want to draw nothing.
+    if (!command.thickness)
+        return CommandResult::Continue;
+
     auto path = to_skia_path(command.path);
     path.offset(command.aa_translation.x(), command.aa_translation.y());
     auto paint = paint_style_to_skia_paint(*command.paint_style, command.bounding_rect().to_type<float>());
@@ -725,6 +733,10 @@ CommandResult DisplayListPlayerSkia::stroke_path_using_paint_style(StrokePathUsi
 
 CommandResult DisplayListPlayerSkia::draw_ellipse(DrawEllipse const& command)
 {
+    // Skia treats zero thickness as a special case and will draw a hairline, while we want to draw nothing.
+    if (!command.thickness)
+        return CommandResult::Continue;
+
     auto const& rect = command.rect;
     auto& canvas = surface().canvas();
     SkPaint paint;
@@ -749,6 +761,10 @@ CommandResult DisplayListPlayerSkia::fill_ellipse(FillEllipse const& command)
 
 CommandResult DisplayListPlayerSkia::draw_line(DrawLine const& command)
 {
+    // Skia treats zero thickness as a special case and will draw a hairline, while we want to draw nothing.
+    if (!command.thickness)
+        return CommandResult::Continue;
+
     auto from = SkPoint::Make(command.from.x(), command.from.y());
     auto to = SkPoint::Make(command.to.x(), command.to.y());
     auto& canvas = surface().canvas();