Fixed definition for click option `extra`

The `/`-syntax seems to only be valid for flags

registrar/cli.py

@@ -61,7 +61,7 @@ def cli():
 @click.option("--progress-set", type=str)
 @click.option("--failure-set", type=str)
 @click.option("--success-set", type=str)
-@click.option("--extra/-e", type=str, multiple=True, default=[])
+@click.option("-e", "--extra", type=str, multiple=True, default=[])
 @click.option("--debug", is_flag=True)
 def daemon(
     config_file=None,