library/RSL_Types: account lengthof params in ts_RSL_MultirateCfg

In TTCN-3 it's not possible to store templates in records, so in
f_assignment_codec() we match received RSL_IE_MR_CONFIG against the
value (not template!) stored in g_pars.expect_mr_conf_ie.

Because of that, the length field is not being calculated by TITAN
for us, so we need to calculate it in ts_RSL_MultirateCfg ourselves.
Automatic length calculation only works during encoding/decoding
and when matching against a receive template.

Change-Id: I595be86d69913ba25e965a5a5c6977e00c342e60

library/RSL_Types.ttcn

@@ -832,7 +832,7 @@ module RSL_Types {
 	template (value) RSL_IE_MultirateCfg ts_RSL_MultirateCfg(boolean icmi := true, uint2_t start_mode := 0,
 								 BIT8 codec_modes := '00000100'B /* 5,90k */,
 								 octetstring params := ''O) := {
-		len := 2,
+		len := 2 + lengthof(params),
 		mr_speech_ver := 1,
 		nscb := false,
 		icmi := icmi,