fix(install) Make wal2json copy more robust #1024
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There is a potential conrner case where we may end up with the wal2json library in the
postgres/wal2json/VERSION/filebut not inpostgres/wal2json/wal2json.so.Not sure exactly how likely this could be, but thechnically it is possible that the download succeeds and
cp "../postgres/wal2json/$VERSION/$FILE_NAME" "$FILE_TO_USE"does not. The next attempt the copy would not be attempted.This fix ensures the copy always happens