don't attempt to restore settings from old qt-settings config file We changed the default settings file name in 2019. It's time to let the old name go. * resource-manager.cc (resource_manager::resource_manager): Don't attempt to copy settings from old qt-settings file used by Octave prior to March 2019.

((nil .
      ((c-file-style . "gnu")
       (indent-tabs-mode . nil)
       (fill-column . 72)))
 (change-log-mode . ((indent-tabs-mode . t)))
 (makefile-mode . ((indent-tabs-mode . t))))