Removed duplicate lines that exist elsewhere

('currency_decimals', '2'), exists in 2.4_to_3.0.sql
('cash_decimals', '2'), already exists above
('cash_rounding_code', '0'), already exists above
This commit is contained in:
Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f