curds: Use folder-music for the toplevel library heading

Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

curds/playlist/manager.py

@@ -8,7 +8,7 @@ import os
 class LibraryManager(list):
     def __init__(self):
         self.name = "Library"
-        self.icon = "folder"
+        self.icon = "folder-music"
 
     def __str__(self):
         return f"<big>{self.name}</big>"

curds/playlist/test_manager.py

@@ -49,7 +49,7 @@ class TestPlaylistManager(unittest.TestCase):
         self.assertEqual(self.cb_plist, plist)
         self.assertEqual(str(self.playman["Library"]), "<big>Library</big>")
         self.assertEqual(self.playman["Library"].name, "Library")
-        self.assertEqual(self.playman["Library"].icon, "folder")
+        self.assertEqual(self.playman["Library"].icon, "folder-music")
         self.assertEqual(plist.name, test_library)
         self.assertIsInstance(plist, library.LibraryPlaylist)