Remove references to no more used lister_db_url conf entry

bin/ghlister

@@ -77,8 +77,6 @@ if __name__ == '__main__':
     args = parse_args()
 
     override_conf = {}
-    if args.db_url:
-        override_conf['lister_db_url'] = args.db_url
 
     lister = GitHubLister(lister_name='github.com',
                           api_baseurl='https://api.github.com',

swh/lister/cli.py

@@ -26,7 +26,6 @@ def cli(db_url, listers, drop_tables):
 
     """
     override_conf = {
-        'lister_db_url': db_url,
         'lister': {
             'cls': 'local',
             'args': {'db': db_url}