Adjust tolerance to fix bezier glitches issue

In a previous CL: https://codereview.chromium.org/1126793003, the value
of gDegenerateToLineTol was changed from 1.0 to 0.25 which caused the
bezier glitches.

This CL changes the value to SK_ScalarRoot2Over2, with this change the
bezier curve looks fine, and the result of the layout tests pointed out
in this bug: https://bugs.chromium.org/p/chromium/issues/detail?id=472847
is also reasonable.

BUG=605439
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1926063002

Review-Url: https://codereview.chromium.org/1926063002
1 file changed