library/RSL_Types.ttcn: fix inadequate template restriction

The 'tr_RSL_UNITDATA_IND' is a 'response' template, so there
is no reason to restrict 'link_id' to any obvious value.

Change-Id: I29ac0a2828b565baa1d2f3ac0a922bc441378f94
diff --git a/library/RSL_Types.ttcn b/library/RSL_Types.ttcn
index 7992132..5afabe1 100644
--- a/library/RSL_Types.ttcn
+++ b/library/RSL_Types.ttcn
@@ -1076,7 +1076,7 @@
 		msg_type := RSL_MT_UNIT_DATA_IND
 	}
 	template RSL_Message tr_RSL_UNITDATA_IND(template RslChannelNr chan_nr,
-						 template (value) RslLinkId link_id,
+						 template RslLinkId link_id,
 						 template octetstring l3_info)
 	modifies tr_RSL_DATA_IND := {
 		msg_type := RSL_MT_UNIT_DATA_IND