Update reference screenshots to fix failing rendering widget test. (#983)

* Update reference screenshots to fix failing rendering widget test.

* Update Playwright Snapshots

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: HaudinFlorence

ui-tests/notebooks/Icon.ipynb

@@ -12,7 +12,7 @@
     "center = [48.265643898808236, 336.7529296875]\n",
     "\n",
     "m = Map(center=center, zoom=7)\n",
-    "icon = Icon(icon_url='https://raw.githubusercontent.com/Leaflet/Leaflet/main/docs/SlavaUkraini/examples/geojson/baseball-marker.png', icon_size=[38, 38], icon_anchor=[22, 94])\n",
+    "icon = Icon(icon_url='https://leafletjs.com/examples/custom-icons/leaf-green.png', icon_size=[38, 38], icon_anchor=[22, 94])\n",
     "mark = Marker(location=center, icon=icon, rotation_angle=10, rotation_origin='22px 94px')\n",
     "m.add_layer(mark);\n",
     "\n",