remove unused scale for direct masks

Using a direct mask, the pixels in the cache are in 1:1 correspondence to the device pixels.
There is no need to scale.

Change-Id: I7d3f48cfb44a51882370527401a3bd0d162d9e76
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/307875
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Herb Derby <herb@google.com>
1 file changed