#1007448 by chalet16: Fix typo in DatabaseSchema_pgsql.

includes/database/pgsql/schema.inc

@@ -368,7 +368,7 @@ public function addField($table, $field, $spec, $new_keys = array()) {
     $this->connection->query($query);
     if (isset($spec['initial'])) {
       $this->connection->update($table)
-        ->fields(array($field, $spec['initial']))
+        ->fields(array($field => $spec['initial']))
         ->execute();
     }
     if ($fixnull) {