fix(install): missing row in sql query, causing PHP warning

Author: btry

install/upgrade_to_2.13.6.php

@@ -71,7 +71,7 @@ public function migrateToRichText() {
 
       foreach ($tables as $table => $fields) {
          $request = [
-            'SELECT' => ['id'] + $fields,
+            'SELECT' => array_merge(['id'], $fields),
             'FROM'   => $table
          ];
          foreach ($DB->request($request) as $row) {