Add W3C Community and Business Groups icon logo to attribution for CG

Author: prushforth

src/mapml/control/AttributionButton.js

@@ -1,7 +1,7 @@
 export var AttributionButton = L.Control.Attribution.extend({
   options: {
     prefix:
-      '<a href="https://www.w3.org/community/maps4html/">Maps for HTML Community Group</a> | <img src="data:image/svg+xml;base64,PHN2ZyBhcmlhLWhpZGRlbj0idHJ1ZSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIiB3aWR0aD0iMTIiIGhlaWdodD0iOCI+PHBhdGggZmlsbD0iIzRDN0JFMSIgZD0iTTAgMGgxMnY0SDB6Ii8+PHBhdGggZmlsbD0iI0ZGRDUwMCIgZD0iTTAgNGgxMnYzSDB6Ii8+PHBhdGggZmlsbD0iI0UwQkMwMCIgZD0iTTAgN2gxMnYxSDB6Ii8+PC9zdmc+" style="padding-right: 0.3em;" alt="Slava Ukraini"> <a href="https://leafletjs.com" title="A JS library for interactive maps">Leaflet</a> '
+      '<img src="https://www.w3.org/community/src/templates/wordpress/StoryTeller/favicon.ico" style="position: relative; top: 5px" alt="W3C Community and Business Groups logo"> <a href="https://www.w3.org/community/maps4html/">Maps for HTML Community Group</a> | <img src="data:image/svg+xml;base64,PHN2ZyBhcmlhLWhpZGRlbj0idHJ1ZSIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIiB3aWR0aD0iMTIiIGhlaWdodD0iOCI+PHBhdGggZmlsbD0iIzRDN0JFMSIgZD0iTTAgMGgxMnY0SDB6Ii8+PHBhdGggZmlsbD0iI0ZGRDUwMCIgZD0iTTAgNGgxMnYzSDB6Ii8+PHBhdGggZmlsbD0iI0UwQkMwMCIgZD0iTTAgN2gxMnYxSDB6Ii8+PC9zdmc+" style="padding-right: 0.3em;" alt="Slava Ukraini"> <a href="https://leafletjs.com" title="A JS library for interactive maps">Leaflet</a> '
   },
 
   onAdd: function (map) {