abis_om2000: for TS conf of dyn TS, always send TCH/F as chan comb

Change-Id: If0693f7c5c85977b0e4acbc701ee5d635434d0d1
diff --git a/openbsc/src/libbsc/abis_om2000.c b/openbsc/src/libbsc/abis_om2000.c
index 357e2e5..b9d8b69 100644
--- a/openbsc/src/libbsc/abis_om2000.c
+++ b/openbsc/src/libbsc/abis_om2000.c
@@ -1264,12 +1264,8 @@
 {
 	switch (ts->pchan) {
 	case GSM_PCHAN_TCH_F_PDCH:
-		if (ts->flags & TS_F_PDCH_ACTIVE)
-			return pchan2comb(GSM_PCHAN_PDCH);
-		else
-			return pchan2comb(GSM_PCHAN_TCH_F);
 	case GSM_PCHAN_TCH_F_TCH_H_PDCH:
-		return pchan2comb(ts->dyn.pchan_is);
+		return pchan2comb(GSM_PCHAN_TCH_F);
 	default:
 		return pchan2comb(ts->pchan);
 	}