Fix bug in NPOT shader wrap mode impl

TBR: michaelludwig@google.com

Change-Id: Ib44081d8ad2cb6fdb7be0fd6a088eda0eeb653bf
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/266947
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed