GSM_SystemInformation: Fix SI2ter description

There's no RachControlParams IE in SI2ter
diff --git a/sysinfo/GSM_SystemInformation.ttcn b/sysinfo/GSM_SystemInformation.ttcn
index 51f687b..1bfc7a4 100644
--- a/sysinfo/GSM_SystemInformation.ttcn
+++ b/sysinfo/GSM_SystemInformation.ttcn
@@ -168,7 +168,6 @@
 	type record SystemInformationType2ter {
 		//SystemInformationHeader		header,
 		NeighbourCellDescription2	extd_bcch_freq_list,
-		RachControlParameters		rach_control,
 		OCT4				rest_octets
 	} with { variant "" };