fix: fix emoji support detection on Chrome on Mac #49
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On Chrome on Mac, unsupported Emoji v13 emoji render as gray boxes. But when we do the support detection, we end up with
0,0,0,61
instead of the expected0,0,0,0
for the image data, i.e. there's an alpha layer of 61. So we render gray boxes for Emoji v13. This fixes that.