stream-clone-test: drop an automatic pattern replacement
That pattern is nice, but it prevent us to glob the number of bytes when we
don't care about them. We don't care about them more often that what we
currently checks so dropping this pattern will help use to simplify various
tests.
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https://www.mercurial-scm.org/wiki/ContributingChanges
If you just want a checklist to follow, you can go straight to
https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist
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273ce12ad8f1` will report some style violations on a very old commit).