Allow Users to See the Actual "String to Expect" Value Being Used by DNS Checks

Currently, when editing a DNS check, the UI always displays the live resolved IP—even if a manual IP was entered in the "String to expect" field. This creates confusion when managing DNS alerts for failover scenarios, where we intentionally monitor for a different IP than what's live. It would be helpful to display the actual saved value being enforced so users can confidently confirm configuration without relying on testing or re-entry.