fix: metrics dns name not set correctly

[lklimek]

Issue being fixed or feature implemented

DNS record "metrics.${var.public_network_name}.networks.${var.main_domain}" is not created successfully.

What was done?

fixed what looks like a copy-paste bug

How Has This Been Tested?

NOT TESTED

Breaking Changes

None

Checklist:

• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have added or updated relevant unit/integration/functional/e2e tests
• [ ] I have made corresponding changes to the documentation

For repository code-owners and collaborators only

• [ ] I have assigned this pull request to a milestone