fix: Use existing bank fields to match by bank account no/IBAN

- Remove newly added fields in Party doctypes to store bank details
- Use Bank Account's fields to match against account no/iban
- For employee, if Bank Account does not exist, find in Employee doctype against account no/iban

erpnext/selling/doctype/customer/customer.json

@@ -61,10 +61,6 @@
   "tax_category",
   "tax_withholding_category",
   "accounting_tab",
-  "bank_details_section",
-  "bank_account_no",
-  "column_break_xtwg",
-  "iban",
   "credit_limit_section",
   "payment_terms",
   "credit_limits",
@@ -559,25 +555,6 @@
   {
    "fieldname": "column_break_54",
    "fieldtype": "Column Break"
-  },
-  {
-   "fieldname": "bank_details_section",
-   "fieldtype": "Section Break",
-   "label": "Bank Details"
-  },
-  {
-   "fieldname": "bank_account_no",
-   "fieldtype": "Data",
-   "label": "Bank Account No"
-  },
-  {
-   "fieldname": "column_break_xtwg",
-   "fieldtype": "Column Break"
-  },
-  {
-   "fieldname": "iban",
-   "fieldtype": "Data",
-   "label": "IBAN"
   }
  ],
  "icon": "fa fa-user",
@@ -591,7 +568,7 @@
    "link_fieldname": "party"
   }
  ],
- "modified": "2023-03-30 15:45:44.387975",
+ "modified": "2023-05-09 15:38:40.255193",
  "modified_by": "Administrator",
  "module": "Selling",
  "name": "Customer",