Revert part of commit 5509a4ef7520bf0b5280ce7d6af8eb15b1b8b0f1

Even though the encryption key length isn't supposed to be taken from
the encryption dictionary's /Length for crypt version 4, other readers
such as Adobe's still use that value if a crypt filter's /Length is
missing.

See https://code.google.com/p/sumatrapdf/issues/detail?id=2710 for a
document where this makes a difference (or simply remove /Length from
the crypt filter in any document encrypted with crypt version 4 and an
AESV2 crypt filter).

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