Fix the constant time 64 test

We were adding more tests than we had data for due to use of
sizeof instead of OSSL_NELEM. I also changed the 8 bit tests
for consistency, although they were already working.
Reviewed-by: NRich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3755)

test/constant_time_test.c

@@ -332,6 +332,6 @@ void register_tests(void)
     ADD_TEST(test_sizeofs);
     ADD_ALL_TESTS(test_binops, OSSL_NELEM(test_values));
     ADD_ALL_TESTS(test_signed, OSSL_NELEM(signed_test_values));
-    ADD_ALL_TESTS(test_8values, sizeof(test_values_8));
-    ADD_ALL_TESTS(test_64values, sizeof(test_values_64));
+    ADD_ALL_TESTS(test_8values, OSSL_NELEM(test_values_8));
+    ADD_ALL_TESTS(test_64values, OSSL_NELEM(test_values_64));
 }