Create conversion invoices fails on Base, BSC, Optimism, and Gnosis

[MantisClone]

Problem

Create Request Form fails to create conversion invoices on several chains:

1. Base
2. BSC
3. Optimism
4. Gnosis (XDAI)
5. Possibly others...

Non-problems

• Regular invoices are created successfully - in which the Invoice Currency is crypto, not fiat.
• Conversion invoices on Mainnet, Sepolia, and Polygon are created successfully, including both USD and EURO invoice currencies.

Solution

• Test creating conversion invoices with all invoice currencies, payment chains, and payment currencies. Document test results.
• Fix the bug

[MantisClone]

Bandaid Solution: We removed the failing currencies in RequestNetwork/web-components#338