RecreateSKPs: Use api.run instead of api.step

This gets us the default env, which includes the missing depot_tools.

NOTRY=true
Bug: skia:
Change-Id: Idc6f9c426eb88c36d8c5d9c9bf9568a9414d61a6
Reviewed-on: https://skia-review.googlesource.com/13587
Reviewed-by: Ravi Mistry <rmistry@google.com>
4 files changed