Fixed timing problem in rpl_heartbeat_basic.test

mysql-test/suite/rpl/t/rpl_heartbeat_basic.test:
  Added sync_slave_with_master to remove timing problem

mysql-test/suite/rpl/t/rpl_heartbeat_basic.test

@@ -367,7 +367,7 @@ DROP EVENT e1;
 
 
 
-
+--sync_slave_with_master
 # Check received heartbeat events while logs flushed on slave
 --connection slave
 --echo *** Flush logs on slave ***