Clean up loose hostname matches

[tbradsha]

Proposed changes

This tightens some hostname matches.

Related product discussion/links

• p1790010272417069-slack-C05Q5HSS013

Does this pull request change what data or activity we track or use?

Testing instructions

Ensure the code has no typos.

[github-actions]

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[github-actions]

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[jp-launch-control]

Code Coverage Summary

Coverage changed in 1 file.

File	Coverage	Δ%	Δ Uncovered
projects/plugins/boost/app/modules/optimizations/image-cdn/src/srcset.ts	53/56 (94.64%)	-3.43%	2 ❤️‍🩹

Full summary · PHP report · JS report

[anomiex]

Looks reasonable, and as far as I can tell stuff still seems to work.