Fix bug in helm chart index (#537)

Author: kevinliu24

charts/index.yaml

@@ -554,7 +554,6 @@ entries:
     - https://github.com/vesoft-inc/nebula-operator/releases/download/v0.9.0/nebula-cluster-0.9.0.tgz
     version: 0.9.0
   nebula-operator:
-   nebula-operator:
   - apiVersion: v2
     appVersion: 1.8.2
     created: "2024-11-12T22:33:01.113742-08:00"