add last move to serialized path

A deserialized path keeps the last move location so that
a subsequent append to the path does not add an unwanted
close verb.

R=reed@oogle.com
BUG=skia:4847
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1702393002

Review URL: https://codereview.chromium.org/1702393002
2 files changed