Fix error in foreign key pointing to old table

htdocs/install/mysql/migration/7.0.0-8.0.0.sql

@@ -32,6 +32,10 @@
 -- -- VMYSQL4.1 DELETE FROM llx_usergroup_user      WHERE fk_usergroup NOT IN (SELECT rowid from llx_usergroup);
 
 
+-- Forgot in < 4.0
+
+ALTER TABLE llx_c_ziptown DROP FOREIGN KEY fk_c_ziptown_fk_pays;
+ALTER TABLE llx_c_ziptown ADD CONSTRAINT fk_c_ziptown_fk_pays   FOREIGN KEY (fk_pays)   REFERENCES llx_c_country(rowid);
 
 -- Forgot in 7.0
 
@@ -48,6 +52,8 @@ ALTER TABLE llx_ecm_files ADD UNIQUE INDEX uk_ecm_files (filepath, filename, ent
 
 UPDATE llx_const set name = __ENCRYPT('INVOICE_FREE_TEXT')__  where name = __ENCRYPT('FACTURE_FREE_TEXT')__;
 
+fk_c_ziptown_fk_pays
+
 
 -- drop very old table (bad name)
 DROP TABLE llx_c_accountancy_category;