node_rpc_proxy: fix fork earliest height caching [RYO backport]

xref https://github.com/ryo-currency/ryo-currency/pull/86

src/wallet/node_rpc_proxy.cpp

@@ -146,7 +146,7 @@ boost::optional<std::string> NodeRPCProxy::get_earliest_height(uint8_t version,
     CHECK_AND_ASSERT_MES(r, std::string(), "Failed to connect to daemon");
     CHECK_AND_ASSERT_MES(resp_t.status != CORE_RPC_STATUS_BUSY, resp_t.status, "Failed to connect to daemon");
     CHECK_AND_ASSERT_MES(resp_t.status == CORE_RPC_STATUS_OK, resp_t.status, "Failed to get hard fork status");
-    m_earliest_height[version] = resp_t.enabled ? resp_t.earliest_height : std::numeric_limits<uint64_t>::max();
+    m_earliest_height[version] = resp_t.earliest_height;
   }
 
   earliest_height = m_earliest_height[version];

src/wallet/wallet2.cpp

@@ -8132,7 +8132,7 @@ bool wallet2::use_fork_rules(uint8_t version, int64_t early_blocks) const
   result = m_node_rpc_proxy.get_earliest_height(version, earliest_height);
   throw_on_rpc_response_error(result, "get_hard_fork_info");
 
-  bool close_enough = height >=  earliest_height - early_blocks && earliest_height != std::numeric_limits<uint64_t>::max(); // start using the rules that many blocks beforehand
+  bool close_enough = height >=  earliest_height - early_blocks; // start using the rules that many blocks beforehand
   if (close_enough)
     LOG_PRINT_L2("Using v" << (unsigned)version << " rules");
   else