set MGF1 digest correctly

set MGF1 digest correctly

Fixes #19290

update rsa_set_ctx_params() so that the digest function used in the
MGF1 construction is set correctly.  Add a test for this to
evp_extra_test.c based on the code scaro-axway provided in #19290.

Reviewed-by: Dmitry Belyavskiy <beldmit@gmail.com>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19342)

(cherry picked from commit e5a7536eaeaacd18d1aea59edeb295fb4eb2dfca)