The autogenerated email for accounts in Assembly includes lz2 string

**Describe the bug**
This is a cosmetic bug as I think has no consequences. Max realized recently when showing me how to delete accounts.

The problem is the AWS autogenerated email for each new account shows the **lz2** string instead of **lz1**.

**To reproduce:**

1. Log with the Master account for the Assembly zone (former LZ1)
2. Open the _Organizations_ service
3. Open _AWS Account_
4. Expand one of the OU, for example _dev_
5. It lists the different accounts in the OU

Under the name of the account, you can see the ID and the AWS autogenerated email, for example
> 123456789012 | aws-lz2-app-a1b2c3-dev@cloud.gov.bc.ca

I would expect
> 123456789012 | aws-lz1-app-a1b2c3-dev@cloud.gov.bc.ca

**Definition of done**
Newly created accounts have a string that is related to Assembly (lz1) instead of Live (lz2)