use higher res to check [-1, 1)

Because the [-1, 1) lerp can handle a higher sampling rate in t,
decrease the t step to ensure everything is covered. The
limit needs to be trimmed by a 1/65536 to allow the older lerps
to run properly.

Remove the scaled test cases. They no longer make sense.
Change-Id: Ida841d65ebe794ba5d0ae67dfb145268764ec6a2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/448101
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
1 file changed