Fix issue where error is thrown when passing context to Set-AzureRmResource

[cormacpayne]

Description

Fix for #5705

Tested with the below setup:

Prerequisites

Disable-AzureRmContextAutosave -Scope CurrentUser
Clear-AzureRmContext -Scope CurrentUser

testingjobs.ps1

param($resource, $ctx)

Set-AzureRmResource -ResourceId $resource.ResourceId -Tag $resource.Tags -DefaultProfile $ctx -Force

Command line

Connect-AzureRmAccount
Select-AzureRmContext -Name {{contextName}}
$resource = Get-AzureRmResource -ResourceId {{resourceId}}
Start-Job -FilePath .\testingjobs.ps1 -ArgumentList ($resource, (Get-AzureRmContext))
Get-Job | Wait-Job
Get-Job | Receive-Job

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate change log has been updated
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • the changes have gone through a cmdlet design review
  • the cmdlet markdown files were generated using the platyPS module