Missing rendering of RachunekWlasnyBanku in bank account section

[Emilz4466]

Description
The PDF visualization does not render the RachunekWlasnyBanku field in the bank account section.
According to the invoice schema, RachunekWlasnyBanku is part of TRachunekBankowy and has predefined enum values. However, when this field is present in XML, it is not displayed in the generated PDF.

To Reproduce
Steps to reproduce the behavior:
Steps to reproduce the behavior:

1. Prepare an invoice XML containing Fa/Platnosc/RachunekBankowy
2. Add the RachunekWlasnyBanku field with one of the allowed values
3. Generate a PDF from the XML using ksef-fop
4. Open the generated PDF and check the bank account section

Expected behavior
When RachunekWlasnyBanku is present in XML, the PDF should display this information in the bank account section.
The predefined schema values should be handled and rendered instead of being ignored.

Desktop (please complete the following information):

• Linux Ubuntu
• Version 25.04

Additional context
In the schema, RachunekWlasnyBanku is defined as part of TRachunekBankowy:
• src/test/resources/Schemat_FA_VAT(3)_v1-0E.xsd

Allowed values are defined in TRachunekWlasnyBanku:
• src/test/resources/Schemat_FA_VAT(3)_v1-0E.xsd

Current rendering logic for bank accounts does not handle this field:
• src/main/resources/templates/fa3/ksef_invoice.xsl