app_talkdetect: Make the module core supported.

This module is used as part of testsuite tests to confirm
stuff works. I'm accordingly marking it as core as it is
required by those tests.

Change-Id: I558e7af7679b22b8ed641d7dd37ee4ca35b11e88

apps/app_talkdetect.c

@@ -26,7 +26,7 @@
  */
 
 /*** MODULEINFO
-	<support_level>extended</support_level>
+	<support_level>core</support_level>
  ***/
 
 #include "asterisk.h"