Fix old email address

svn path=/icecast/trunk/icecast/; revision=19136

admin/xspf.xsl

 <!--
-    XSPF xslt stylesheet for Icecast 2.3.2 and above
-    Copyright (C) 2007 Thomas B. Ruecker, tbr@ruecker-itk.de
+    XSPF xslt stylesheet for Icecast and above
+    Copyright (C) 2007 Thomas B. Ruecker, thomas@ruecker.fi
 
     This program is free software; you can redistribute it and/or
     modify it under the terms of the GNU General Public License