cli: bring back long lost current playlist item marker

After 10 years of absence :(

share/lua/intf/cli.lua

@@ -215,7 +215,8 @@ function playlist(name,client,arg)
     function playlist0(item,prefix)
         local prefix = prefix or ""
         if not item.flags.disabled then
-            local str = "| "..prefix..tostring(item.id).." - "..
+            local marker = ( item.id == vlc.playlist.current() ) and "*" or " "
+            local str = "|"..prefix..marker..tostring(item.id).." - "..
                             ( item.name or item.path )
             if item.duration > 0 then
                 str = str.." ("..common.durationtostring(item.duration)..")"