fixed typo

mysql-test/main/mdl.test

@@ -84,7 +84,7 @@ DROP TABLE t1,t3;
 --echo #
 --echo # MDEV-28820 MyISAM wrong server status flags
 --echo #
---disable_service_connection
+--disable_view_protocol
 # MyISAM alone doesn't start a transaction or takes transactional MDL
 create table t1 (a int);
 set autocommit=0;
@@ -120,7 +120,7 @@ disconnect foo;
 connection default;
 set autocommit=default;
 drop table t2;
---enable_service_connection
+--enable_view_protocol
 
 --echo #
 --echo # End of 10.4 tests