Exchange Revaluation Account field options for currency symbol

In the DocType “Exchange Revaluation Account” there is a need to add currency code field name in field balance_in_account_currency options to ensure that the currency symbol shows correctly on the screen.

Just a costmetic change so that the correct currency prefix is used to display the account balance.

ERPNext: v11.0.3-beta.32 () (staging)

Frappe Framework: v11.0.3-beta.46 () (staging)