CKV_AZURE_114 fix sample features incorrect resource

[Link to policy](https://github.com/hlxsites/prisma-cloud-docs/blob/main/docs/en/enterprise-edition/policy-reference/azure-policies/azure-general-policies/ensure-that-key-vault-secrets-have-content-type-set.adoc)

The check is referred to `azurerm_key_vault_secret`, but the proposed fix is referring to `azurerm_key_vault`, which does not feature the `content_type` parameter at all.