Update challenge-group.md

PRCI-Lab · Aug 7, 2024 · c014137 · c014137
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 - If you have any questions about the challenge, you can discuss it in the [Google Group](https://groups.google.com/g/mmvpr/).
-- You can also join the WeChat Group by the QR code.<br><img src="./figs/WeChat%20Group.jpg" alt="WeChatGroup" style="width: 240px; height: 280px;">
+- You can also join the WeChat Group by the QR code.<br><img src="./figs/WeChat%20Group.jpg" alt="WeChatGroup" style="width: 180px; height: 280px;">