Revert "Merge pull request #1281 from RuleDomain/migrate-sales-tax-history"

This reverts commit 11e1cc51aa, reversing
changes made to b32c23ce10.

# Conflicts:
#	application/models/Sale.php

database/database.sql

@@ -96,9 +96,7 @@ INSERT INTO `ospos_app_config` (`key`, `value`) VALUES
 ('default_origin_tax_code', ''),
 ('cash_decimals', '2'),
 ('financial_year', '1'),
-('giftcard_number', 'series'),
-('migrate_sales_history', '0'),
-('migrate_sales_history_block', '0');
+('giftcard_number', 'series');
 
 
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