Add windows2019-cell to update-hwc-buildpack
Add windows2019-cell to update-hwc-buildpack

[#164880633](https://www.pivotaltracker.com/story/show/164880633)

Signed-off-by: Sebastian Vidrio <68ba84219e4e2d7d15fed3ed668bd2821314e420@pivotal.io>

cloudfoundry/cf-deployment,cloudfoundry/cf-deployment