stop using the commands handler

qutebrowser/app.py

@@ -726,7 +726,7 @@ class Quitter:
         # Now we can hopefully quit without segfaults
         log.destroy.debug("Deferring QApplication::exit...")
         objreg.get('signal-handler').deactivate()
-        objreg.get('session-manager').session_delete('_autosave', force=True)
+        objreg.get('session-manager').delete('_autosave')
         # We use a singleshot timer to exit here to minimize the likelihood of
         # segfaults.
         QTimer.singleShot(0, functools.partial(qApp.exit, status))

qutebrowser/browser/browsertab.py

@@ -686,7 +686,7 @@ class AbstractTab(QWidget):
     @pyqtSlot(bool)
     def _on_load_finished(self, ok):
         sess_manager = objreg.get('session-manager')
-        sess_manager.session_save('_autosave', quiet=True, force=True)
+        sess_manager.save('_autosave')
         if ok and not self._has_ssl_errors:
             if self.url().scheme() == 'https':
                 self._set_load_status(usertypes.LoadStatus.success_https)