move it server fails to start when config uses listen instead of origin

[TAlonglong]

Describe the bug
move it server fails to start when config uses listen instead of origin

[2024-02-29 16:47:05,110 DEBUG    trollmoves.server] Created request manager on port 9152
Traceback (most recent call last):
  File "/software/miniconda/envs/pytroll/bin/move_it_server.py", line 113, in <module>
    main()
  File "/software/miniconda/envs/pytroll/bin/move_it_server.py", line 103, in main
    server.reload_cfg_file(cmd_args.config_file)
  File "/software/miniconda/envs/pytroll/lib/python3.10/site-packages/trollmoves/server.py", line 360, in reload_cfg_file
    self.reload_config(filename,
  File "/software/miniconda/envs/pytroll/lib/python3.10/site-packages/trollmoves/server.py", line 330, in reload_config
    old_glob = _update_chains(self.chains, new_chain_configs, self.request_manager, use_polling,
  File "/software/miniconda/envs/pytroll/lib/python3.10/site-packages/trollmoves/server.py", line 698, in _update_chains
    chain.create_notifier(notifier_builder, use_polling, function_to_run_on_matching_files)
  File "/software/miniconda/envs/pytroll/lib/python3.10/site-packages/trollmoves/server.py", line 753, in create_notifier
    pattern = globify(self.config["origin"])
KeyError: 'origin'

Environment Info:

• OS: linux jammy
• Trollmoves Version: 0.14.0