[BUG]Metamask crashes POS
**Describe the bug**
When choosing to pay with Metamask it crashes the POS and a JS error is thrown:
`Refused to load https://metamask.io/en-GB/download because it does not appear in the frame-ancestors directive of the Content Security Policy.`

**To Reproduce**

1. Enable example USDT payments
2. Create invoice or use POS to pay, choose metamask
3. See POS crashes (disappears) and JS error is logged.

**Expected behavior**
It should not crash

**Desktop (please complete the following information):**

- Linux Noble + BitCart (master.sh) installed today

