Skip composeshader_bitmap GM on 64-bit Win CPU Test bots

Temporary measure to get the bots green while the real issue is sorted out.

BUG=skia:5315
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1989323002

Review-Url: https://codereview.chromium.org/1989323002
2 files changed