try polling mpd once per second once again

I reverted this becaause elapsed time counter was not
synchronized with mpd and it sometimes stalled and then
increased by 2 seconds. for now I count elapsed time locally,
so I can apply it again (until something else pops out, lol)

src/status.cpp

@@ -118,7 +118,7 @@ void TraceMpdStatus()
 	
 	gettimeofday(&now, 0);
 	if ((Mpd->Connected()
-	&&   ((now.tv_sec == past.tv_sec && now.tv_usec >= past.tv_usec+500000) || now.tv_sec > past.tv_sec))
+	&&   (/*(now.tv_sec == past.tv_sec && now.tv_usec >= past.tv_usec+500000) || */now.tv_sec > past.tv_sec))
 	||  UpdateStatusImmediately
 	   )
 	{