Incorrect context setting for chroma when a (quantized) coefficient of exactly 0x100000 is coded

See !876 (closed)

$ export AOM_SIMD_CAPS_MASK=0
$ aomdec /tmp/tennis.ivf -o /tmp/tennis.yuv --rawvideo
[..]
$ tools/dav1d -i /tmp/tennis.ivf -o /tmp/tennis.dav1d.yuv --cpumask=0
[..]
$ diff -q /tmp/tennis.yuv /tmp/tennis.dav1d.yuv
Files /tmp/tennis.yuv and /tmp/tennis.dav1d.yuv differ

tennis.ivf

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