fix table name in migration script

htdocs/install/mysql/migration/3.3.0-3.4.0.sql

@@ -350,7 +350,7 @@ ALTER TABLE llx_opensurvey_user_studs ADD INDEX idx_id_sondage (id_sondage);
 
 ALTER TABLE llx_boxes ADD COLUMN params varchar(255);
 
-UPDATE llx_extrafield SET elementtype='socpeople' WHERE elementtype='contact';
-UPDATE llx_extrafield SET elementtype='actioncomm' WHERE elementtype='action';
-UPDATE llx_extrafield SET elementtype='adherent' WHERE elementtype='member';
-UPDATE llx_extrafield SET elementtype='societe' WHERE elementtype='company';
+UPDATE llx_extrafields SET elementtype='socpeople' WHERE elementtype='contact';
+UPDATE llx_extrafields SET elementtype='actioncomm' WHERE elementtype='action';
+UPDATE llx_extrafields SET elementtype='adherent' WHERE elementtype='member';
+UPDATE llx_extrafields SET elementtype='societe' WHERE elementtype='company';