fix(install): possible upgrade issue

with installs older then 2.5 glpi_plugin_formcreator_forms_answers may exist when upgratinf to 2.7

Signed-off-by: Thierry Bugier <[email protected]>

Author: btry

install/upgrade_to_2.7.php

@@ -104,6 +104,7 @@ public function upgrade(Migration $migration) {
          );
       }
       $table = 'glpi_plugin_formcreator_formanswers';
+      $migration->backupTables([$table]);
       $migration->renameTable('glpi_plugin_formcreator_forms_answers', $table);
       $migration->migrationOneTable($table);
       $migration->dropField($table, 'is_deleted');