Fix SW sRGB dst + LCD coverage bug.

We're using the linear procs for sRGB destintations
and the sRGB procs for linear destinations.  Fix that.

C.f. State32::getLCDProc(), which flags |= kDstIsSRGB_LCDFlag.
kDistIsSRGB is (1<<2) == 4, so the sRGB procs must be 4-7, not 0-3.

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2177493002

Review-Url: https://codereview.chromium.org/2177493002
1 file changed