fix(install): reorder key changes on conditions table

Signed-off-by: Thierry Bugier <tbugier@teclib.com>

Author: btry

install/upgrade_to_2.9.php

@@ -291,9 +291,10 @@ public function upgrade(Migration $migration) {
       }
       $migration->migrationOneTable($table);
       $migration->changeField($table, 'show_field', 'plugin_formcreator_questions_id', 'integer', ['value' => '0', 'comment' => 'question to test for the condition']);
-      $migration->addKey($table, ['plugin_formcreator_questions_id']);
       $migration->dropKey($table, 'plugin_formcreator_questions_id');
-      $migration->addKey($table, ['itemtype', 'items_id']);
+      $migration->migrationOneTable($table);
+      $migration->addKey($table, ['plugin_formcreator_questions_id']);
+      $migration->addKey($table, ['itemtype', 'items_id'], 'item');
       $migration->addPostQuery("UPDATE `$table` SET `itemtype` = 'plugin_formcreator_question' WHERE `itemtype` = ''");
 
       // Remove show_condition enum for conditions