Fix: sql query error

htdocs/install/mysql/migration/3.0.0-3.1.0.sql

@@ -478,7 +478,7 @@ ALTER TABLE llx_c_type_contact    ADD COLUMN module        varchar(32) NULL;
 ALTER TABLE llx_c_type_fees       ADD COLUMN module        varchar(32) NULL;
 ALTER TABLE llx_c_typent          ADD COLUMN module        varchar(32) NULL;
 
-ALTER TABLE llx_user ADD ref_ext varchar(30) AFTER entity
+ALTER TABLE llx_user ADD ref_ext varchar(30) AFTER entity;
 ALTER TABLE llx_user ADD civilite varchar(6) AFTER pass_temp;
 ALTER TABLE llx_user ADD signature text DEFAULT NULL AFTER email;