bsc: fix TC_{early,late}_conn_fail: dyn PDCH: clean up cfg

When leaving TS 6 in Osmocom style dyn TS mode, the initialization of the BTS
will cause a RSL Chan Activ, which the tests BSC_Tests.TC_early_conn_fail and
BSC_Tests.TC_late_conn_fail will interpret as the channel activation that they
expect to come from the Channel Request. They will hence issue the Conn Fail
message before the lchan is established, and are getting confused on what they
expect to happen.

Change-Id: I2bde987eefe7129c9f7c3b81b624d55cb66a75d0
diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index 0107091..328fc59 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -2346,6 +2346,9 @@
 	f_sleep(1.0);
 	f_ts_dyn_mode_assert(0, 0, chan_nr.tn, TCHF_MODE);
 
+	/* clean up config */
+	f_ts_set_chcomb(0, 0, 6, "PDCH");
+
 	setverdict(pass);
 }
 
@@ -2380,6 +2383,9 @@
 	f_sleep(1.0);
 	f_ts_dyn_mode_assert(0, 0, chan_nr.tn, TCHF_MODE);
 
+	/* clean up config */
+	f_ts_set_chcomb(0, 0, 6, "PDCH");
+
 	setverdict(pass);
 }
 
@@ -2444,6 +2450,9 @@
 	f_sleep(1.0);
 	f_ts_dyn_mode_assert(0, 0, chan_nr.tn, PDCH_MODE);
 
+	/* clean up config */
+	f_ts_set_chcomb(0, 0, 6, "PDCH");
+
 	setverdict(pass);
 }
 
@@ -2470,6 +2479,9 @@
 	f_sleep(1.0);
 	f_ts_dyn_mode_assert(0, 0, chan_nr.tn, NONE_MODE);
 
+	/* clean up config */
+	f_ts_set_chcomb(0, 0, 6, "PDCH");
+
 	setverdict(pass);
 }