SqlWindowsFirewall: Unable to remove its own created rules

Details of the scenario you try and problem that is occurring:
There is a parameter 'Ensure' in this resource, but it does not evaluate 'Absent'. That means that the resource can not remove its own create rules.

Logic need to be added to this resource so that the rules can be removed when Ensure equals 'Absent'.

The DSC configuration that is using the resource (as detailed as possible):

xSQLServerFirewall 'InstanceFirewallConfiguration'
{
    Ensure = 'Absent'
    SourcePath = '\\fileserver.company.local\images'
    SourceFolder = 'SQL2016'
    InstanceName = 'SQL2016'
    Features = 'SQLEngine,Rs,Is,As'
}

Version of the Operating System, SQL Server and PowerShell the DSC Target Node is running:
Windows Server 2012 R2, SQL Server 2016, PowerShell 5.0

Version of the DSC module you're using, or 'dev' if you're using current dev branch:
Dev

The issue names the SqlWindowsFirewall resource and the xSQLServerFirewall DSC configuration; start by locating how that resource handles Ensure and reproduce the supplied Ensure = 'Absent' configuration. Done means the resource removes the firewall rules it created when Ensure is Absent.