Remove default kratos webhook secret

backend/helpers/auth_guard.py

@@ -30,10 +30,7 @@ def kratos_webhook():
         @wraps(fn)
         def decorator(*args, **kwargs):
             header = request.headers.get("Authorization")
-            # TO DO: uncomment line below once merged to main
-            # if header is not None and header == os.environ.get("KRATOS_WEBHOOK_SECRET"):
-            # TO DO: remove line below once merged to main
-            if header is not None and header == os.environ.get("KRATOS_WEBHOOK_SECRET", "test-kratos-hooks-remove-before-merge"):
+            if header is not None and header == os.environ.get("KRATOS_WEBHOOK_SECRET"):
                 return fn(*args, **kwargs)
             else:
                 raise Unauthorized("This needs a valid api key.")