Update storageAzureFiles bicep module

[pazdedav]

Overview/Summary

This change updates the varDirectoryServiceOptions variable in the module to correctly configure the storage account for 'Entra ID Domain Services' integration, as required by the resource definition

This PR fixes/adds/changes/removes

1. 590

Breaking Changes

Testing Evidence

After deploying the Baseline workload from a local fork that has this variable changed, the deployment succeeds when using EntraDS as a value for avdIdentityServiceProvider parameter.

As part of this Pull Request I have

• [x] Read the Contribution Guide and ensured this PR is compliant with the guide
• [ ] Ensured the resource API versions in .bicep file/s I am adding/editing are using the latest API version possible
• [x] Checked for duplicate Pull Requests
• [x] Associated it with relevant GitHub Issues
• [ ] (AVD LZA Team Only) Associated it with relevant ADO Items
• [x] Ensured my code/branch is up-to-date with the latest changes in the main branch
• [x] Performed testing and provided evidence.
• [ ] Updated relevant and associated documentation (e.g. Contribution Guide, Module READMEs, Docs etc.)

[danycontre]

@pazdedav thanks for the great finding and contribution.