bsc: TC_paging_resp_unsol: Avoid encoding l3 twice

Change-Id: I4c5ea6272325671e47a91124a7efe0321c9f3a02
diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index 106f8b4..0cc9552 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -3668,7 +3668,7 @@
 	dt.idx := {0, 0};
 
 	/* Send unsolicited Paging response (no matching Paging CMD stored in BSC) */
-	f_ipa_tx(ts_RSL_EST_IND(dt.rsl_chan_nr, valueof(ts_RslLinkID_DCCH(0)), enc_PDU_ML3_MS_NW(l3)));
+	f_ipa_tx(ts_RSL_EST_IND(dt.rsl_chan_nr, valueof(ts_RslLinkID_DCCH(0)), rr_pag_resp));
 
 
 	/* Expevct a CR with a matching Paging response on the A-Interface */