fix MGCP timeout timer

Timer X1 is not defined in libosmo-mgcp-client, so this tdef had no effect.
Change this to X2427.
(libosmo-mgcp-client recently moved T2427001 to X2427.)

(X2 is still used in call_leg.c itself)

Related: OS#4539
Related: If097f52701fd81f29bcca1d252f4fb4fca8a04f7 (osmo-mgw)
Change-Id: I9804fdb2c24f49910f2386e3788bd1107b8ebc40
diff --git a/src/libmsc/call_leg.c b/src/libmsc/call_leg.c
index b1d0b1e..056a392 100644
--- a/src/libmsc/call_leg.c
+++ b/src/libmsc/call_leg.c
@@ -43,7 +43,7 @@
 };
 
 struct osmo_tdef g_mgw_tdefs[] = {
-	{ .T=-1, .default_val=4, .desc="MGCP response timeout" },
+	{ .T=-2427, .default_val=4, .desc="MGCP response timeout" },
 	{ .T=-2, .default_val=30, .desc="RTP stream establishing timeout" },
 	{}
 };