Recycle reflog commits only for the non-filtered ones.
If we're not filtering, FilteredReflogCommits and ReflogCommits are the same. If
we then enter filtering and get reflog entries again, and pass a
lastReflogCommit, we'd recycle the previous FilteredReflogCommits, which are
unfiltered, so that's no good. Work around this by simply never using the
recycle mechanism when getting the filtered reflog commits.
We could do better by remembering what the last filter path or author was, and
only suppressing the recycling when it changed; but that's more complexity than
I want to add, so hopefully this is good enough.
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