rind: Escape playlist names

Otherwise gtk will complain about unescaped markup.

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

rind/manager.py

@@ -43,6 +43,8 @@ class ManagerModel(GObject.GObject, Gtk.TreeModel):
             return ""
         if column == 0:
             return plist.icon
+        if isinstance(plist, curds.Playlist):
+            return GLib.markup_escape_text(str(plist))
         return str(plist)
 
     def do_iter_children(self, parent):