regenTextureCoordinates is always true when calling doRegen

* Rename doRegen -> updateTextureCoordinatesMaybeStrike
* Collapse all regenTextureCoordinates if statements

Change-Id: I0afba60c657f9b805b07247673d9f24c265b9a0b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/262937
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
2 files changed