Fix repositories not being properly escaped

In gitolite configuration variable which controls commit access must
not include dash.

scripts/gitolite/rebuild_gitolite.php

@@ -11,7 +11,7 @@ require_once $root.'/scripts/__init_script__.php';
 // utilities instead.
 
 function escape_name($name) {
-  return preg_replace('/[^A-Za-z0-9\-]/', '_', $name);
+  return preg_replace('/[^A-Za-z0-9]/', '_', $name);
 }
 
 function startswith($string, $prefix) {