Delete payments when a publisher allowance is paid

### Describe the bug

Deleting a publisher (i.e. nakaphoto) does not delete related payments.
Currently we only delete the `allowance` entry not the payments.

### Screenshots

- Delete the nakaphoto entry

- Payment still visible

### To Reproduce

Steps to reproduce the behavior:

1. Visit 'Websites'
1. Delete an entry which has payments
1. Open the popup
1. Related (outgoing) transactions are still visible

### Expected behavior

After deleting a publisher the related payments should be gone as well.

### Additional context

- Allowance delete is happening here:
https://github.com/getAlby/lightning-browser-extension/blob/master/src/extension/background-script/actions/allowances/delete.ts
- In case of getting an allowance we're adding related payments here:
https://github.com/getAlby/lightning-browser-extension/blob/master/src/extension/background-script/actions/allowances/getById.ts#L32-L36
- Getting all related payments and delete them:
https://dexie.org/docs/Collection/Collection.delete()

This issue is related to #1505

Start in src/extension/background-script/actions/allowances/delete.ts, then inspect how related payments are added in getById.ts around lines 32-36. Use the linked Dexie collection deletion documentation to trace the related-payment records. Done means deleting a publisher removes its allowance and related payments, so the transactions no longer appear in the popup.

Written by the indexing model from the issue text.