ecc: Use faster b parameter for Ed25519.
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ecc: Use faster b parameter for Ed25519.

* cipher/ecc-curves.c (domain_parms): Replace b.
* tests/t-mpi-point.c (test_curve): Ditto.

This change has been suggested by NIIBE Yutaka:

Here,

  0x98412DFC9311D490018C7338BF8688861767FF8FF5B2BEBE27548A14B235EC8FEDA4

is: (121666^-1 mod q)*121665.

(121666^-1) * 121665 mod q is:

  0x2DFC9311D490018C7338BF8688861767FF8FF5B2BEBE27548A14B235ECA6874A

While it works for both, I think that shorter is better.