[recoveryservicesbackup] minor fix for long running operation customer issue

[hiaga]

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API Change Check

APIView identified API level changes in this PR and created the following API reviews

Language	API Review for Package
Swagger	Microsoft.RecoveryServices
Java	com.azure.resourcemanager:azure-resourcemanager-recoveryservicesbackup
JavaScript	@azure/arm-recoveryservicesbackup
Python	azure-mgmt-recoveryservicesbackup
Go	sdk/resourcemanager/recoveryservices/armrecoveryservicesbackup

[hiaga]

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[pcsin]

Some of the automated checks are failing, and from the initial review the change is not following the async provisioning guide - https://github.com/Azure/azure-resource-manager-rpc/blob/master/v1.0/async-api-reference.md#asynchronous-operations

Pls ensure the swagger lint checks pass.