decoder/Thread: on late SEEK, start decoder at seek position

Previously, a bogus value (whatever happened to be still in
`start_time`) was used.

NEWS

@@ -5,6 +5,7 @@ ver 0.21.14 (not yet released)
   - sidplay: strip text from "Date" tag
 * player
   - fix crash after song change
+  - fix seek position after restarting the decoder
 
 ver 0.21.13 (2019/08/06)
 * input

src/decoder/Thread.cxx

@@ -455,6 +455,11 @@ static void
 decoder_run_song(DecoderControl &dc,
 		 const DetachedSong &song, const char *uri, Path path_fs)
 {
+	if (dc.command == DecoderCommand::SEEK)
+		/* if the SEEK command arrived too late, start the
+		   decoder at the seek position */
+		dc.start_time = dc.seek_time;
+
 	DecoderBridge bridge(dc, dc.start_time.IsPositive(),
 			     /* pass the song tag only if it's
 				authoritative, i.e. if it's a local