bsc: test TSC in various messages

In a recent osmo-bsc patch:

"allow explixit TSC Set and TSC on chan activ / modif / assignment"
c33eb8d56943b8981523754b081967e6ff5f245d
Ic665125255d7354f5499d10dda1dd866ab243d24

I accidentally changed the default behavior of the Training Sequence
Code sent to BTS and MS. So now, make sure that we verify the expected
Training Sequence Code in BSC_Tests, in:

RSL Channel Activate
RR Immediate Assignment
RR Assignment Command
RR Channel Mode Modify
RSL Mode Modify

Related: OS#5172 SYS#5315
Change-Id: Id67a949e0f61ec8123976eb8d336f04510c55c01
diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index 6f603b1..9ea0269 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -684,6 +684,9 @@
 	pars.exp_ms_power_level := mp_exp_ms_power_level;
 	pars.mscpool.bssap_idx := bssap_idx;
 
+	/* BTS 0 has BSIC 10 (and no explicit timeslot training_sequence_code config), so expecting TSC = (BSIC & 7) = 2 */
+	pars.expect_tsc := 2;
+
 	return pars;
 }