fix: missing colon in event name for dynamic model arguments

[KaelWD]

🤔 What is the nature of this change?

• [ ] New feature
• [x] Fix bug
• [ ] Style optimization
• [ ] Code style optimization
• [ ] Performance optimization
• [ ] Build optimization
• [ ] Refactor code or style
• [ ] Test related
• [ ] Other

🔗 Related Issue

fixes #602 fixes #679

💡 Background or solution

https://vue-jsx-explorer.netlify.app/#const%20v%20%3D%20(%3C%3E%0A%20%20%3CMyComp%20v-model%3Atitle%3D%7B%20title.value%20%7D%3E%3C%2FMyComp%3E%0A%20%20%3CMyComp%20v-model%3D%7B%20%5Btitle.value%2C%20'title'%5D%7D%3E%3C%2FMyComp%3E%0A%20%20%3CMyComp%20v-model%3D%7B%20%5Btitle.value%2C%20key%5D%7D%3E%3C%2FMyComp%3E%0A%3C%2F%3E)%0A

📝 Changelog

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🇨🇳 Chinese

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• [ ] Demo is updated/provided or not needed
• [ ] TypeScript definition is updated/provided or not needed
• [ ] Changelog is provided or not needed

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[luocong2016]

@KaelWD @cexbrayat @Jinjiang @kazupon @FloEdelmann

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