Improve Wiki reference

[vitorelli]

Hello @mattleibow

Thanks for your amazing work by integrating MAUI and XHarnerss. I think, it would be helpful to include on wiki page (https://github.com/mattleibow/DeviceRunners/wiki/CLI-Device-Runner-for-Android-using-XHarness#running-tests) adding the following arguments:
-p:TestingMode=XHarness -p:CI=true

This will provide a better result returned by dotnet xharness.