[nobuildbot] Rename Win bots back to Win8/Win10

BUG=skia:

Change-Id: If66bdfc6cf15e11129048ee748430c3887132b75
Reviewed-on: https://skia-review.googlesource.com/5351
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Eric Boren <borenet@google.com>
tree: f7fca5106ed573a8477546ddca0ddc51cacb6b2a
  1. recipe_modules/
  2. recipes.py
  3. recipes/