In the discovered item configuration form, the Host interface dropdown field is displayed as an input element when it is read-only, even though, when enabled, it is represented by a dropdown element.

Steps to reproduce:
1. Create an LLD rule on any host.
2. Create an item prototype on this host.
3. Discover an item from this prototype.
4. Open the discovered item configuration form.
5. Check the Host interface field.

Result:
The read-only Host Interface field is displayed as an input element.

Expected:
The read-only Host Interface field should be displayed as an dropdown element.