[IMP] account: test data: don't define any currency on test bank journal

The constraint introduced in https://github.com/odoo/odoo/commit/22f0da809e84618901b7ca4b78582abd64c03c55 raised in case the currency of the company loading the test data was also USD.

addons/account/test/account_minimal_test.xml

@@ -284,7 +284,6 @@
             <field name="type">bank</field>
             <field name="default_debit_account_id" ref="usd_bnk"/>
             <field name="default_credit_account_id" ref="usd_bnk"/>
-            <field name="currency_id" ref="base.USD"/>
             <field name="bank_account_id" ref="bank_account_usd"/>
         </record>
         <record id="base.main_company" model="res.company">