Remove fInputColor usage in unit-test FPs

Change-Id: If467390cd3e1d33f0e72db4b75f9889d4562af5a
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/341722
Commit-Queue: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
2 files changed