Update emoji in README.md

The emoji string in the README.md file was changed to better align with project's focus on images. The '💬' (chat) emoji was removed, leaving only the '📸' (camera) emoji.

README.md

@@ -1,6 +1,6 @@
 ---
 title: WebcamGPT
-emoji: 💬📸
+emoji: 📸
 colorFrom: pink
 colorTo: purple
 sdk: gradio