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Fix scan_endstr offset in longest_match slow path.

LONGEST_MATCH_SLOW was using len - (STD_MIN_MATCH+1) instead of
len - (STD_MIN_MATCH-1) for the end-of-string hash probe, hashing a
window inside the already-matched region instead of ending one byte
past the current match. The slow path was missing match extensions
it should have been finding. The comment and the upstream fast_zlib
source both specify the correct offset.

Closes #2248.

Reported-by: Sergey "Shnatsel" Davidoff <291257+Shnatsel@users.noreply.github.com>
Reported-by: Folkert de Vries <7949978+folkertdev@users.noreply.github.com>

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