Fix ecdsa digest setting code to match dsa.

Fix ecdsa digest setting code to match dsa.

Fixes #13422

ecdsa_set_ctx_params() was not setting the digest correctly. The side
effect noted was that the check for sha1 when signing was not being
done in fips mode.

Also fixed the dupctx() so that propq is deep copied.
The usage of the variable 'flag_allow_md' was also copied from the dsa code.

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/13520)