more hard coded 'http' in macros.vm

Here is a fix for removing hard coded 'http' through ${request.scheme}

— macros.vm.orig 2008-06-27 15:04:58.000000000 +0200
+++ macros.vm 2008-06-27 15:08:17.000000000 +0200
@@ -162,8 +162,8 @@

1. 1. Displays the status for the given AIM id
      ##
      #macro(aim $id)
      -#set($onurl = "http://${request.serverName}${xwiki.getSkinFile('aimonline.gif')}")
      -#set($offurl = "http://${request.serverName}${xwiki.getSkinFile('aimoffline.gif')}")
      +#set($onurl = "${request.scheme}://${request.serverName}${xwiki.getSkinFile('aimonline.gif')}")
      +#set($offurl = "${request.scheme}://${request.serverName}${xwiki.getSkinFile('aimoffline.gif')}")
      <img border="0" src="http://big.oscar.aol.com/nvludo?on_url=${onurl}&off_url=${offurl}" alt="Online detector"></a>
      #end
      ##