Fix the new ps_grant test to clean itself up properly.

mysql-test/r/ps_grant.result:
  Update results
mysql-test/t/ps_grant.test:
  Fix cleanup of test

mysql-test/r/ps_grant.result

@@ -78,5 +78,4 @@ drop user second_user@localhost ;
 commit ;
 show grants for second_user@localhost ;
 ERROR 42000: There is no such grant defined for user 'second_user' on host 'localhost'
-drop table t1,t9 ;
 drop database mysqltest;

mysql-test/t/ps_grant.test

@@ -114,7 +114,6 @@ commit ;
 --error 1141
 show grants for second_user@localhost ;
 
-drop table t1,t9 ;
 drop database mysqltest;