We've switched from aesctr to aes as default cipher quite some time

ago.  Therefore adjust the example encryption key from 160 to 128
bits.
Noticed by jmc@.

src/etc/ipsec.conf

@@ -1,4 +1,4 @@
-#	$OpenBSD: ipsec.conf,v 1.2 2006/03/07 09:08:30 jmc Exp $
+#	$OpenBSD: ipsec.conf,v 1.3 2006/08/24 12:23:30 hshoexer Exp $
 #
 # See ipsec.conf(5) for syntax and examples.
 
@@ -23,4 +23,4 @@ ike esp from 192.168.3.1 to 192.168.3.2 \
 flow esp from 192.168.7.0/24 to 192.168.8.0/24 peer 192.168.3.2
 esp from 192.168.3.1 to 192.168.3.2 spi 0xdeadbeef:0xbeefdead \
 	authkey 0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa:0xaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa \
-	enckey 0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee:0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
+	enckey 0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee:0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee