Listener: Fixed misleading logged error message on TLS handshake

The default error messages in the Network domain call the peer
"server" and the local process "client", which is backwards.
This results in misleading error logs when a TLS handshake fails,
like "server rejected the client TLS certificate" when actually it's
the other way around!
Fixed this by simply swapping the strings "client" and "server" when
logging errors in the Network domain when establishing a connection.

REST/Server.cc

@@ -169,8 +169,15 @@ namespace litecore::REST {
     void Server::handleConnection(sockpp::stream_socket&& sock) {
         auto responder = make_unique<ResponderSocket>(_tlsContext);
         if ( !responder->acceptSocket(std::move(sock)) || (_tlsContext && !responder->wrapTLS()) ) {
-            c4log(ListenerLog, kC4LogError, "Error accepting incoming connection: %s",
-                  responder->error().description().c_str());
+            C4Error error = responder->error();
+            string description = error.description();
+            if (error.domain == NetworkDomain) {
+                // The default messages call the peer "server" and me "client"; reverse that:
+                replace(description, "server", "CLIENT");
+                replace(description, "client", "server");
+                replace(description, "CLIENT", "client");
+            }
+            c4log(ListenerLog, kC4LogError, "Error accepting incoming connection: %s", description.c_str());
             return;
         }