Fixed script to set domain (refs #21163).

set_app_domain.py

@@ -28,7 +28,6 @@ class SetAppDomain():
     NGINX_SERVER_NAME_PATTERN = r'\s*server_name\s+([\w\-\_\.\ ]+);'
 
     def __init__(self, *args):
-        self.display_header()
         args = list(args)
         # Check if help is required
         if '-h' in args: