FIX management of extrafields in modulebuilder

htdocs/modulebuilder/template/sql/llx_mymodule_myobject_extrafields.key.sql

@@ -0,0 +1,19 @@
+-- Copyright (C) ---Put here your own copyright and developer email---
+--
+-- This program is free software; you can redistribute it and/or modify
+-- it under the terms of the GNU General Public License as published by
+-- the Free Software Foundation; either version 3 of the License, or
+-- (at your option) any later version.
+--
+-- This program is distributed in the hope that it will be useful,
+-- but WITHOUT ANY WARRANTY; without even the implied warranty of
+-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+-- GNU General Public License for more details.
+--
+-- You should have received a copy of the GNU General Public License
+-- along with this program. If not, see http://www.gnu.org/licenses/.
+
+
+-- BEGIN MODULEBUILDER INDEXES
+ALTER TABLE llx_mymodule_myobject_extrafields ADD INDEX idx_fk_object(fk_object);
+-- END MODULEBUILDER INDEXES