Fixing a typo in the patch for MDEV-10780, which caused default.test failure.

Fixing the "connect" command to use "localhost" instead of "127.0.0.1"
to make it work with both "mtr" and "mtr --embedded".

mysql-test/t/default.test

@@ -196,7 +196,7 @@ DROP TABLE t1;
 --echo #
 
 # Note, the problem was not repeatable with a non-fresh connection.
---connect (con1,127.0.0.1,root,,test)
+--connect (con1,localhost,root,,test)
 CREATE TABLE t1 (pk INT AUTO_INCREMENT PRIMARY KEY) ENGINE=MyISAM;
 INSERT INTO t1 VALUES ();
 INSERT INTO t1 VALUES ();