Fix MX tests

Missed some of these. One had a bad DDL statement to begin with (mixed
up column type and column name) and other was just master/worker order.

src/test/regress/expected/multi_mx_ddl.out

@@ -142,9 +142,9 @@ Indexes:
 \c - - - :master_port
 SET client_min_messages TO debug2;
 CREATE INDEX ddl_test_index ON mx_ddl_table(value);
+DEBUG:  building index "ddl_test_index" on table "mx_ddl_table"
 NOTICE:  using one-phase commit for distributed DDL commands
 HINT:  You can enable two-phase commit for extra safety with: SET citus.multi_shard_commit_protocol TO '2pc'
-DEBUG:  building index "ddl_test_index" on table "mx_ddl_table"
 RESET client_min_messages;
 DROP INDEX ddl_test_index;
 -- show that sequences owned by mx tables result in unique values

src/test/regress/expected/multi_mx_modifying_xacts.out

@@ -183,7 +183,7 @@ ABORT;
 -- applies to DDL
 BEGIN;
 INSERT INTO labs_mx VALUES (6, 'Bell labs_mx');
-ALTER TABLE labs_mx ADD COLUMN text motto;
+ALTER TABLE labs_mx ADD COLUMN motto text;
 ERROR:  distributed DDL commands must not appear within transaction blocks containing single-shard data modifications
 COMMIT;
 -- doesn't apply to COPY after modifications

src/test/regress/sql/multi_mx_modifying_xacts.sql

@@ -154,7 +154,7 @@ ABORT;
 -- applies to DDL
 BEGIN;
 INSERT INTO labs_mx VALUES (6, 'Bell labs_mx');
-ALTER TABLE labs_mx ADD COLUMN text motto;
+ALTER TABLE labs_mx ADD COLUMN motto text;
 COMMIT;
 
 -- doesn't apply to COPY after modifications