Paste button isn't shown on mobile web

[agordeev]

Tested on example app.

On iOS, the long press shows the paste button.

On web iOS, the long press does nothing.

iOS app (works as expected):

https://github.com/Tkko/Flutter_Pinput/assets/2883524/e266e8c3-2e32-400a-82b5-1c98372baf5e

iOS web app (doesn't work as expected):

https://github.com/Tkko/Flutter_Pinput/assets/2883524/9a12c690-b6fc-4745-bd4e-cd2c7a9d708e