Custom permissions guard cannot be specified

[sabina1997]

Description
I am using custom permissions for a role of api guard. The custom permissions should be created under api guard but there is no way of specifying it, it defaults to web when running shield:generate

To Reproduce
Steps to reproduce the behavior:

1. Add a custom permission to filament_shield.custom_permissions array
2. Run filament shield:generate --all
3. See permission created on guard web