[pathops] Remove SK_IGNORE_PATHOPS_SIMPLIFY_TRIVIAL_FIX

Users have been updated and this flag is no longer needed.

Change-Id: I998a1b36ad74670257df14c1e6613bec9e425465
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/765399
Auto-Submit: Ben Wagner <bungeman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed