[REM] Unnecessary `size` parameters on char fields

addons/account/account.py

addons/account/account_analytic_line.py

addons/account/account_bank_statement.py

addons/account/account_financial_report.py

addons/account/account_invoice.py

addons/account/account_move_line.py

addons/account/partner.py

addons/account/project/project.py

addons/account/report/account_entries_report.py

addons/account/report/account_report.py

addons/account/wizard/account_financial_report.py

addons/account/wizard/account_fiscalyear_close.py

addons/account/wizard/account_invoice_refund.py

addons/account/wizard/account_reconcile.py

addons/account/wizard/pos_box.py

addons/account_analytic_plans/account_analytic_plans.py

addons/account_asset/account_asset.py

addons/account_asset/report/account_asset_report.py

addons/account_asset/wizard/account_asset_change_duration.py

...count_bank_statement_extensions/account_bank_statement.py