Removed default cryptonote address

- Removed `localhost:8080` default value to address string in wallet rpc
- Added an error response in case string is empty

fixed indentation

removed if and errors, default to localhost and port based on nettype

Forgot ":"

forgot ; and m_

removed wallet_rpc_server_error_codes.h

src/wallet/wallet2.cpp

@@ -30,6 +30,7 @@
 
 #include <algorithm>
 #include <numeric>
+#include <string>
 #include <tuple>
 #include <queue>
 #include <boost/format.hpp>
@@ -1360,6 +1361,10 @@ bool wallet2::set_daemon(std::string daemon_address, boost::optional<epee::net_u
 {
   boost::lock_guard<boost::recursive_mutex> lock(m_daemon_rpc_mutex);
 
+  if(daemon_address.empty()) {
+    daemon_address.append("http://localhost:" + std::to_string(get_config(m_nettype).RPC_DEFAULT_PORT));
+  }
+
   if(m_http_client->is_connected())
     m_http_client->disconnect();
   CHECK_AND_ASSERT_MES2(m_proxy.empty() || proxy.empty() , "It is not possible to set global proxy (--proxy) and daemon specific proxy together.");