add top height to get_output_distribution, and cache it for rct

This should cache the vast majority of calls for long running wallets

src/wallet/wallet2.cpp

@@ -5905,6 +5905,7 @@ void wallet2::get_outs(std::vector<std::vector<tools::wallet2::get_outs_entry>>
       auto end = std::unique(req_t.amounts.begin(), req_t.amounts.end());
       req_t.amounts.resize(std::distance(req_t.amounts.begin(), end));
       req_t.from_height = std::max<uint64_t>(segregation_fork_height, RECENT_OUTPUT_BLOCKS) - RECENT_OUTPUT_BLOCKS;
+      req_t.to_height = segregation_fork_height + 1;
       req_t.cumulative = true;
       m_daemon_rpc_mutex.lock();
       bool r = net_utils::invoke_http_json_rpc("/json_rpc", "get_output_distribution", req_t, resp_t, m_http_client, rpc_timeout * 1000);