solaar: use only timer thread to save config.yaml

lib/solaar/configuration.py

@@ -22,7 +22,6 @@ import threading
 
 import yaml as _yaml
 
-from gi.repository import GLib
 from logitech_receiver.common import NamedInt as _NamedInt
 
 from solaar import __version__
@@ -142,7 +141,7 @@ def save(defer=False):
     else:
         with configuration_lock:
             if not save_timer:
-                save_timer = threading.Timer(5.0, lambda: GLib.idle_add(do_save))
+                save_timer = threading.Timer(5.0, do_save)
                 save_timer.start()