Revert "Always apply mipmap sharpening on GPU"

This reverts commit 1aedd5dc117db2d71ba052319132e54975eef6e8.

Reason for revert: breaking units tests left and right

Original change's description:
> Always apply mipmap sharpening on GPU
>
> Bug: skia:13078
>
> Change-Id: If459a96eba09fb10e967bc364435f79b83fdc1ec
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/522099
> Reviewed-by: Michael Ludwig <michaelludwig@google.com>
> Commit-Queue: Brian Salomon <bsalomon@google.com>

Bug: skia:13078
Change-Id: If24ed4782c922347132bf9fc0dac7e8a266540ba
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/524296
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
8 files changed