Small improvement for Chronometer

[DL6ER]

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• I have read and understood the contributors guide, as well as this entire template.
• I have made only one major change in my proposed changes.
• I have tested my proposed changes, and have included unit tests where possible.
• I am willing to help maintain this change if there are issues with it later.
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• I have squashed any insignificant commits. (git rebase)
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What does this PR aim to accomplish?:

Fix a potential issue as discussed here: https://discourse.pi-hole.net/t/bad-file-descriptor-output-when-using-chronometer/6234

How does this PR accomplish the above?:

Exchange hard-coded domain localhost by hard-coded address 127.0.0.1