set mode: fix --help

'set mode' --help does not show the correct program name:

    ogcli [-h] [--center-id CENTER_ID] [--room-id ROOM_ID]
    ^^^^^      [--client-ip CLIENT_IP] --mode MODE

Adds full program name (ogcli set mode) in missing prog option
when creating the argparse object.

cli/objects/modes.py

@@ -18,7 +18,7 @@ class OgModes():
 
 	@staticmethod
 	def set_modes(rest, args):
-		parser = argparse.ArgumentParser()
+		parser = argparse.ArgumentParser(prog='ogcli set mode')
 		group = parser.add_argument_group('clients', 'Client selection args')
 		group.add_argument('--center-id',
 				   type=int,