azurerm_app_configuration - fix issue when removing encryption block

[teowa]

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Description

The issue was found and resolved by @ziyeqf that in the update method we need to set an empty value {} to remove the encryption in PATCH method.

There are other tests failures but should be fixed in PR #27415

PR Checklist

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Changes to existing Resource / Data Source

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Testing

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TF_ACC=1 go test -v ./internal/services/appconfiguration -parallel 5 -run TestAccAppConfiguration_encryptionUpdated -timeout 2h -ldflags="-X=github.com/hashicorp/terraform-provider-azurerm/version.ProviderVersion=acc"
=== RUN   TestAccAppConfiguration_encryptionUpdated
=== PAUSE TestAccAppConfiguration_encryptionUpdated
=== CONT  TestAccAppConfiguration_encryptionUpdated
--- PASS: TestAccAppConfiguration_encryptionUpdated (557.15s)
PASS
ok      github.com/hashicorp/terraform-provider-azurerm/internal/services/appconfiguration      557.204s

Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• azurerm_app_configuration - fix issue when removing encryption block

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #0000

Note

If this PR changes meaningfully during the course of review please update the title and description as required.