deserialise: use the right one of {,c}params.

The serialised game stores a long-term and a short-term parameter
structure, which correspond to me->params (the thing that gets used by
the next New Game command) and me->curparams (the thing that _was_
used to generate _this_ game). So data relevant to the current game
ought to be validated against the latter, but in fact I was
accidentally passing the former to several validation calls.

I think this probably avoided causing a problem because typically
params and cparams don't differ very much: the usual reason why
they're not the same is that somebody has manually entered a game
description involving an incomplete description of the parameters
(lacking generation-specific details like difficulty level), but by
the very fact that those incomplete descriptions have to contain
_enough_ information to understand a specific game description,
copying just those parts of the description into the long-term params
structure makes the two similar enough that validation won't fail.

However, testing an upcoming patch which calls midend_deserialise at a
more difficult moment (specifically, just after midend_set_params,
meaning that the two params structures can now differ _arbitrarily_)
reveals my error. Fixed to use cparams where that's the right thing.

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