Change filtering on Environment variables as it currently breaks ASP.NET 3.5 on 1803

[shirhatti]

<environmentVariables>
  <add name="DRIVERDATA" value="C:\Windows\System32\Drivers\DriverData" />
  <add name="PATH" value="C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Users\ContainerAdministrator\AppData\Local\Microsoft\WindowsApps" />
</environmentVariables>

[shirhatti]

• Don't add DRIVERDATA
• Don't add PATH

[mcy94w]

Close the issue since the PR is completed.