contrib/test_decoding: adjust expected output

Expected output has changed because of psql replica identity output
changes.

Reported by Christoph Berg

contrib/test_decoding/expected/ddl.out

@@ -345,6 +345,7 @@ WITH (user_catalog_table = true)
  options  | text[]  |                                                                   | extended |              | 
 Indexes:
     "replication_metadata_pkey" PRIMARY KEY, btree (id)
+Replica Identity: DEFAULT
 Has OIDs: no
 Options: user_catalog_table=true
 
@@ -360,6 +361,7 @@ ALTER TABLE replication_metadata RESET (user_catalog_table);
  options  | text[]  |                                                                   | extended |              | 
 Indexes:
     "replication_metadata_pkey" PRIMARY KEY, btree (id)
+Replica Identity: DEFAULT
 Has OIDs: no
 
 INSERT INTO replication_metadata(relation, options)
@@ -374,6 +376,7 @@ ALTER TABLE replication_metadata SET (user_catalog_table = true);
  options  | text[]  |                                                                   | extended |              | 
 Indexes:
     "replication_metadata_pkey" PRIMARY KEY, btree (id)
+Replica Identity: DEFAULT
 Has OIDs: no
 Options: user_catalog_table=true
 
@@ -394,6 +397,7 @@ ALTER TABLE replication_metadata SET (user_catalog_table = false);
  rewritemeornot | integer |                                                                   | plain    |              | 
 Indexes:
     "replication_metadata_pkey" PRIMARY KEY, btree (id)
+Replica Identity: DEFAULT
 Has OIDs: no
 Options: user_catalog_table=false