[REM]account: removed decimal precision.

Task: https://www.odoo.com/web#id=10944&view_type=form&model=project.task&menu_id=3942&action=327
Pad : https://pad.odoo.com/p/r.t24p6lMJBRTobP85

Removed  decimal precision in those files:
1. account.py
2. account_bank_statement.py
3. account_cash_statement.py 
4. account_invoice.py 
5. account_reconcile.py
6. account_register_payment.py
7. pos_box.py
8. account_entries_report.py
9. account_invoice_report.py

Thanks