remotefilelog: actually fix (and test this time) a bytes vs str issue
I attempted this in
94670e124d29 but we didn't actually have any tests for this
function it seems, and I mistook "it works now" for it being fixed (when what
had actually happened was that my cache had populated enough that I didn't
trigger the minimum threshold on my reattempts).
Differential Revision: https://phab.mercurial-scm.org/D7785
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