rollback sender_cc change

Author: renky

install/sql/incremental/upd_dev_collection.sql

@@ -38,7 +38,6 @@ ALTER TABLE `dns_rr` CHANGE `type` `type` ENUM('A','AAAA','ALIAS','CNAME','DNAME
 
 -- change cc and sender_cc column type
 ALTER TABLE `mail_user` CHANGE `cc` `cc` TEXT CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '';
-ALTER TABLE `mail_user` CHANGE `sender_cc` `sender_cc` TEXT CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL DEFAULT '';
 
 -- was missing in incremental, inserted for fixing older installations
 ALTER TABLE `web_domain` ADD `folder_directive_snippets` TEXT NULL AFTER `https_port`;