SkLiteDL: add some missing std::move()

This cuts a ref+unref roundtrip on all draw{Bitmap,Image}

I set this up originally and just... forgot.
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2234483002

Review-Url: https://codereview.chromium.org/2234483002
1 file changed