fix: remove SQL changes for Datahub plugin to avoid migration failure (#8855)

Author: jahow

web/src/main/webapp/WEB-INF/classes/setup/sql/migrate/v447/migrate-default.sql

@@ -3,6 +3,3 @@ UPDATE Settings SET value='0' WHERE name='system/platform/subVersion';
 
 INSERT INTO Settings (name, value, datatype, position, internal) VALUES ('system/banner/enable', 'false', 2, 1920, 'n');
 INSERT INTO Settings (name, value, datatype, position, internal) VALUES ('system/auditable/enable', 'false', 2, 12010, 'n');
-
-ALTER TABLE Sources ADD COLUMN datahubEnabled BOOLEAN DEFAULT FALSE;
-ALTER TABLE Sources ADD COLUMN datahubConfiguration TEXT DEFAULT '';