Fix missing reset of debug_sync, which could cause subsequent test to fail.

mysql-test/include/function_defaults_notembedded.inc

@@ -92,3 +92,4 @@ FLUSH TABLE t1;
 SELECT * FROM t1;
 
 DROP TABLE t1;
+SET debug_sync = 'RESET';

mysql-test/r/function_defaults_notembedded.result

@@ -85,6 +85,7 @@ a	b
 5	1982-03-20 20:22:34
 6	1982-03-20 20:22:34
 DROP TABLE t1;
+SET debug_sync = 'RESET';
 #
 # Function defaults run 2. Six digits scale on seconds precision.
 #
@@ -169,3 +170,4 @@ a	b
 5	1982-03-20 20:22:34.876543
 6	1982-03-20 20:22:34.876543
 DROP TABLE t1;
+SET debug_sync = 'RESET';