GGSN_Tests: Don't expect Used-Service-Unit AVP in Gy CCR INITIAL

open5gs 125740727e558c7604897eda711d4d40f2906239 changed behavior and is
no longer sending the Used-Service-Unit AVP during INITIAL_REQUEST,
which makes sense since those values should be only initialized and
spec seems to more or less expect it that way, though receiving it at
INITIAL time should be accepted too AFAICT.

Related: https://github.com/open5gs/open5gs/pull/2721
Change-Id: Ia16a86ff10089974e0b5d49e594467fcd437ce7e
---
M ggsn_tests/GGSN_Tests.ttcn
M pgw/PGW_Tests.ttcn
2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/ggsn_tests/GGSN_Tests.ttcn b/ggsn_tests/GGSN_Tests.ttcn
index 5b1f7a1..d6a0403 100644
--- a/ggsn_tests/GGSN_Tests.ttcn
+++ b/ggsn_tests/GGSN_Tests.ttcn
@@ -534,7 +534,6 @@
 						tr_AVP_MultipleServicesIndicator,
 						tr_AVP_Multiple_Services_Credit_Control(content := superset(
 							tr_AVP_Requested_Service_Unit,
-							tr_AVP_Used_Service_Unit,
 							tr_AVP_PCC_3GPP_QoS_Information,
 							tr_AVP_GI_3GPP_RatType(rat_type)
 						)),
diff --git a/pgw/PGW_Tests.ttcn b/pgw/PGW_Tests.ttcn
index 182147d..bafabdf 100644
--- a/pgw/PGW_Tests.ttcn
+++ b/pgw/PGW_Tests.ttcn
@@ -363,7 +363,6 @@
 					tr_AVP_MultipleServicesIndicator,
 					tr_AVP_Multiple_Services_Credit_Control(content := superset(
 						tr_AVP_Requested_Service_Unit,
-						tr_AVP_Used_Service_Unit,
 						tr_AVP_PCC_3GPP_QoS_Information,
 						tr_AVP_GI_3GPP_RatType(rat_type)
 					)),

