Handle ConnectionRefusedError when starting wav2mp3d.

This typically means that the socket file is left, but the daemon
itself is no longer running.  Try to spawn a new one.

mp3wavweb.py

@@ -94,7 +94,7 @@ def get_daemon_connection():
     try:
         return multiprocessing.connection.Client(mp3wavcfg.socketpath,
                                                  'AF_UNIX')
-    except FileNotFoundError:
+    except (FileNotFoundError, ConnectionRefusedError):
         pass
 
     try: