fix another freeradius script typo

diff --git a/freeradius-server b/freeradius-server
index 72df225..b4d2808 160000 (submodule)
--- a/freeradius-server
+++ b/freeradius-server
@@ -1 +1 @@
-Subproject commit 72df225a35b33c7e178734dd5130ebfc6af70002
+Subproject commit b4d2808bd1a859e3524c1b582387610140bd7070