Suppress jpeg valgrind errors

Do a better job suppressing these errors until I can prioritize fixing
them.

BUG=skia:4550
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1641763002

Review URL: https://codereview.chromium.org/1641763002
1 file changed