make authmodulelist be only modules that are installed with core package
the other modules are appended to list by sed.

--- courier-authlib-0.71.4/authdaemonrc.in.orig	2022-05-21 22:10:44.871319461 +0200
+++ courier-authlib-0.71.4/authdaemonrc.in	2022-05-21 22:11:30.434405958 +0200
@@ -24,7 +24,7 @@
 # by removing them from the following list.  The available modules you
 # can use are: @ALLMODULES@
 
-authmodulelist="@ALLMODULES@"
+authmodulelist="authpam authcustom"
 
 ##NAME: authmodulelistorig:4
 #