test/params_test.c: use TEST_double_eq to check doubles
test/params_test.c: use TEST_double_eq to check doubles

TEST_ulong_eq was used previously because TEST_double_eq didn't exist
at the time.

Reviewed-by: Nicola Tuveri <5a38b4ac03c90be61ead22c1d11b6e9f49425984@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/8469)

openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl,openssl/openssl