Fix ref for external/wpt/svg/painting/reftests/paint-order-001.svg

The property:

  paint-order: stroke markers

is equivalent to:

  paint-order: stroke markers fill

(Spec: "If any of the three keywords are omitted, they are painted last,
 in the order they would be painted with paint-order: normal."
 @ https://svgwg.org/svg2-draft/painting.html#PaintOrder )

So the fill should be painted last. Add 'marker:none' to the appropriate
element in the ref.

Disable stroke and marker in a few cases to avoid "overdraw" and thus
"incorrect" edge rendering in some cases.

BUG=872972

Change-Id: I835a6980fa069825ed2a2e920862018faec6d93c