Remove redundant tls secured function

tests/unittests/xmpp/stub_xmpp.c

@@ -37,7 +37,7 @@ const char * session_get_domain(void)
     return NULL;
 }
 
-gboolean connection_conn_is_secured(void)
+gboolean connection_is_secured(void)
 {
     return 1;
 }