crypto: remove unnecessary OpenSSL_add_all_digests

`OpenSSL_add_all_algorithms` implicitly adds both digests and
ciphers. No need in calling `OpenSSL_add_all_digests` after it.

src/node_crypto.cc

@@ -4052,7 +4052,6 @@ void Certificate::ExportChallenge(const FunctionCallbackInfo<Value>& args) {
 void InitCryptoOnce() {
   SSL_library_init();
   OpenSSL_add_all_algorithms();
-  OpenSSL_add_all_digests();
   SSL_load_error_strings();
   ERR_load_crypto_strings();