MGCP_Test: fix config file include path

The config file mistakenly references the defaults for the MSC.

- correct include path to use MGCP_Test.default

Change-Id: I12c6907717dfba1c31790a2b71f42e37743351af
diff --git a/mgw/MGCP_Test.cfg b/mgw/MGCP_Test.cfg
index 0cca79e..90d736b 100644
--- a/mgw/MGCP_Test.cfg
+++ b/mgw/MGCP_Test.cfg
@@ -2,7 +2,7 @@
 # Common configuration, shared between test suites
 "../Common.cfg"
 # testsuite specific configuration, not expected to change
-"./MSC_Tests.default"
+"./MGCP_Test.default"
 
 # Local configuration below