Bug fix in SQL data masking when updating rule

[yoavrubin]

No description provided.

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[markcowl]

@azuresdkci retest this please

[markcowl]

PowerShell on demand run here: http://azuresdkci.cloudapp.net/view/1-AzurePowerShell/job/powershell-on-demand/155/

[yoavrubin]

Re-run the on demand, now it passes http://azuresdkci.cloudapp.net/view/1-AzurePowerShell/job/powershell-on-demand/155/