[BUG]After I created a wallet, I got an error(I configured an ETH testnet installation.)
Hi,

This project is amazing, absolutely underestimated. I love it!

**Describe the bug**
After I created a wallet, a tip error appeared above the ID column of the datatable: 
"Error loading wallet. Either the currency of this wallet is no longer supported or it was disabled on the server. Check server logs for more information"

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

I configured an ETH testnet installation(I unchecked BTC installation and no lightning).
Installation is done successfully.
I can open admin panel and store.

1. Create a wallet
2. Set contract to USDT
3. Set xpub to Metamask's public key
4. Save

**Server:**

- OS: Ubuntu 20.04(self-hosted)
- Version 20.04

