drop grants for sipwise user in 0080_grants_dbs.up

otherwise installer fails with:

| [...]
| Applying revision script /usr/share/ngcp-db-schema/db_scripts/base/0080_grants_dbs.up: done
| ERROR 1045 (28000): Access denied for user 'sipwise'@'localhost' (using pssword: YES)
| [...]

Related to previous fix, addressing
https://bugtracker.sipwise.com/view.php?id=2463

Needs review before release!

From: Michael Prokop <mprokop@sipwise.com>

db_scripts/base/0080_grants_dbs.up

@@ -35,8 +35,6 @@ GRANT SELECT,INSERT,UPDATE ON billing.* TO 'rateomat'@'localhost' IDENTIFIED BY
 GRANT SELECT,INSERT,UPDATE ON accounting.* TO 'sems_prepaid'@'localhost' IDENTIFIED BY 'PW_SEMS_PREPAID';
 GRANT SELECT,INSERT,UPDATE ON billing.* TO 'sems_prepaid'@'localhost' IDENTIFIED BY 'PW_SEMS_PREPAID';
 
-GRANT ALL PRIVILEGES ON *.* TO 'sipwise'@'localhost' IDENTIFIED BY 'PW_SIPWISE' WITH GRANT OPTION;
-
 GRANT ALL PRIVILEGES ON kamailio.* to 'dbcleaner'@'localhost' IDENTIFIED BY 'PW_CLEANUP_TOOLS';
 GRANT ALL PRIVILEGES ON accounting.* to 'dbcleaner'@'localhost' IDENTIFIED BY 'PW_CLEANUP_TOOLS';