Update main.js

[cratom4]

💻 变更类型 | Change Type

• ✨ feat
• 🐛 fix
• 💄 style
• 🔨 chore
• 📝 docs

🔀 变更说明 | Description of Change

Fix related to prompt format

-Removed function to convert {}, [] brackets into (), so that prompt editing works on lobe UI.
-Fixed where extra space remains before comma.

📝 补充信息 | Additional Information

[lobehubbot]

👍 @cratom4

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