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[fix] Reject offers with `client_max_window_bits` below config

When a server is configured with `clientMaxWindowBits = N` and a client
offers `client_max_window_bits = M` where `M < N`, the server must not
respond with a value greater than `M`.

Previously the server accepted such offers and responded with
`client_max_window_bits = N`. The analogous check for
`serverMaxWindowBits` already existed; this commit adds the symmetric
check for `clientMaxWindowBits`.

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