fix: 'Assets' access 'robots.txt'，but 'Cancel' button didn't work

[fxzer]

🐛 The bug

1. click 'robots.txt'

2. click 'Cancel'

🛠️ To reproduce

https://github.com/antfu/yak-shaving-map/tree/main

🌈 Expected behavior

Click the button to close the pop-up

ℹ️ Additional context

No response