Improve: Use download link with share button instead of current window's URL.

Using download link instead of current window's URL make it possible to start playing the current media in external player.

bot/server/templates/player.html

@@ -138,7 +138,7 @@
             if (navigator.share) {
               navigator.share({
                 title: "Play",
-                url: window.location.href
+                url: mediaLink
               });
             }
           };