webhooks: Rename api_key_only_webhook_view to webhook_view.

There are no other types of webhook views; this is more concise.

zerver/webhooks/gocd/view.py

@@ -5,7 +5,7 @@ from typing import Any, Dict
 
 from django.http import HttpRequest, HttpResponse
 
-from zerver.decorator import api_key_only_webhook_view
+from zerver.decorator import webhook_view
 from zerver.lib.request import REQ, has_request_variables
 from zerver.lib.response import json_success
 from zerver.lib.webhooks.common import check_send_webhook_message
@@ -18,7 +18,7 @@ MESSAGE_TEMPLATE = (
     'Comment: {}'
 )
 
-@api_key_only_webhook_view('Gocd')
+@webhook_view('Gocd')
 @has_request_variables
 def api_gocd_webhook(request: HttpRequest, user_profile: UserProfile,
                      payload: Dict[str, Any]=REQ(argument_type='body'),