Fix rsa_sigalg_set_ctx_params() to return 1 for unknown parameters.

Fix rsa_sigalg_set_ctx_params() to return 1 for unknown parameters.

This keeps the code consistent with the changes done for other
algorithms that support sigalg_set_ctx_params().

set_ctx_params() should always return 1 if the parameter is unknown.

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/25570)