ensure that keccak is called on view spend key, not a possibly pre-sc_reduce32 version of it

- for deriving view secret key

src/cryptonote_core/account.cpp

@@ -65,7 +65,7 @@ DISABLE_VS_WARNINGS(4244 4345)
 
     // rng for generating second set of keys is hash of first rng.  means only one set of electrum-style words needed for recovery
     crypto::secret_key second;
-    keccak((uint8_t *)&first, sizeof(crypto::secret_key), (uint8_t *)&second, sizeof(crypto::secret_key));
+    keccak((uint8_t *)&m_keys.m_spend_secret_key, sizeof(crypto::secret_key), (uint8_t *)&second, sizeof(crypto::secret_key));
 
     generate_keys(m_keys.m_account_address.m_view_public_key, m_keys.m_view_secret_key, second, two_random ? false : true);