Fixed Redbook playback which was not repeating the CD after finishing

CHANGELOG.txt

@@ -3,6 +3,7 @@ D2X-Rebirth Changelog
 20120329
 --------
 main/multi.c, main/multi.h, main/net_udp.c, main/net_udp.h: Immediately relay pdata packets from clients to others which should reduce artificial delay; allow sending of pdata packet when firing if enough time has passed since last update; only answer full game info requests 2 times per second and lite info 8 times per second
+main/songs.c: Fixed Redbook playback which was not repeating the CD after finishing
 
 20120328
 --------

main/songs.c

@@ -375,6 +375,7 @@ int songs_play_song( int songnum, int repeat )
 void redbook_first_song_func()
 {
 	stop_time();
+	Song_playing = -1; // Playing Redbook tracks will not modify Song_playing. To repeat we must reset this so songs_play_level_song does not think we want to re-play the same song again.
 	songs_play_level_song(1, 0);
 	start_time();
 }