hd-rum-translator: Force recompression for conference

Previously the --conference-compression parameter would only work for
automatic output ports (sending back to participants who are sending to
us), while the hosts explicitely specified on cmdline would default to
packet reflecting mode (and not receive the mixed video).

src/hd-rum-translator/hd-rum-translator.cpp

@@ -585,7 +585,7 @@ struct host_opts {
     int rx_port;
     int tx_port;
     int mtu;
-    char *compression;
+    const char *compression;
     char *fec;
     long long int bitrate;
     int force_ip_version;
@@ -1102,7 +1102,11 @@ int main(int argc, char **argv)
             tx_port = params.hosts[i].tx_port;
         }
 
-        const auto& h = params.hosts[i];
+        auto& h = params.hosts[i];
+
+        if(!h.compression && params.out_conf.mode == CONFERENCE){
+            h.compression = params.conference_compression;
+        }
 
         int idx = create_output_port(&state,
                 h.addr, rx_port, tx_port, state.bufsize, h.force_ip_version,