BSC_Tests: Add missing routing context to modulepar

The BSSAP_Configuration leaves the rctx parameter unbound.

- Make sure that rctx is set to 0

Change-Id: If0f08665694be8eba817a4525686a9a37caf1dbb

bsc/BSC_Tests.ttcn

@@ -106,7 +106,8 @@ modulepar {
 		own_ssn := 254,
 		peer_pc := 187,
 		peer_ssn := 254,
-		sio := '83'O
+		sio := '83'O,
+		rctx := 0
 	};
 }