azurerm_storage_account - Fix error when enabling identity and cmk

[magodo]

Fix #16374

Test

💤  TF_ACC=1 go test -v -timeout=20h ./internal/services/storage -run='TestAccStorageAccount_updateToUsingIdentityAndCustomerManagedKey'
=== RUN   TestAccStorageAccount_updateToUsingIdentityAndCustomerManagedKey
=== PAUSE TestAccStorageAccount_updateToUsingIdentityAndCustomerManagedKey
=== CONT  TestAccStorageAccount_updateToUsingIdentityAndCustomerManagedKey
--- PASS: TestAccStorageAccount_updateToUsingIdentityAndCustomerManagedKey (994.86s)
PASS
ok      github.com/hashicorp/terraform-provider-azurerm/internal/services/storage       994.876s

[tombuildsstuff]

LGTM 👍

[github-actions]

This functionality has been released in v3.3.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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