path_stroke_with_zero_length: turn off drawFat() by default.

The replay modes cannot readback, and so cannot draw the fat parts, which
means we've had to exempt them from checking that they draw identically.

I don't mind if we leave it alone, but I thought I'd check to see your opinion.

BUG=skia:4095
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1862113004

Review URL: https://codereview.chromium.org/1862113004
3 files changed