ensure host xrd is correct, even if installed in subpath

include/hostxrd.php

@@ -1,10 +1,10 @@
 <?php
 
-function hostxrd($hostname) {
+function hostxrd($baseurl) {
 
 	header("Content-type: text/xml");
 	$tpl = file_get_contents('view/xrd_host.tpl');
-	echo str_replace('$domain',$hostname,$tpl);
+	echo str_replace('$domain',$baseurl,$tpl);
 	session_write_close();
 	exit();