libsaria: Set initial matching ids

This should be initialized to the set of all ids to begin with.  That
way everything will match.

libsaria/sources/library/index.py

@@ -41,8 +41,10 @@ def add_tracks(tracks):
 		add_to_index(id, track.title)
 
 def reindex():
+	global matching
 	for src, tracks in library.lib_dict.iteritems():
 		add_tracks(tracks)
+	matching = all_ids
 
 def is_visible(id):
 	return id in matching