Android: The gray border around the quote didn't interact well with the
image, which needed to overlap the border. For now we'll just remove the
border.
Also made the thumbnail image 2px bigger because I noticed that in some
cases there was a partial-pixel space below the image (where the rest of
the quote was making the container bigger).
iOS: The gray border around outgoing quotes was fading into the
background gray color, making the quote look a tiny bit more narrow than
the main message. Removed the border.
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