Fix trickycubicstrokes and widebuttcaps bg colors on GpuTess

Setting the max tessellation segments to 5 for GpuTess caused some of
these backgrounds to incorrectly show up as red.

Change-Id: Ie6b7b44e5500e1dd23df2e7f6b3783bcabcc614d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/412556
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
2 files changed