Confusing error: "This room is unfederated" when inviting someone on the same server to an unfederated room without perms

### Steps to reproduce

1. Create a room that's unfederated & select a user on the same server as the room
2. As a separate user without permission to invite to the room, try to invite the user
3. Observe the error message says that the room is unfederated
4. Add the permission to invite
5. Try again, and observe success, indicating it's not an unfederated room issue

### Outcome

#### What did you expect?
The error should read "You do not have permission to invite to this room"

#### What happened instead?
The error read "This room is unfederated. You cannot invite people from external servers."

### Operating system

macOS

### Browser information

Ferdium v6.6.0 with Chrome 118.0.5993.89

### URL for webapp

https://chat.casavant.org

### Application version

Element version: 1.11.51 Crypto version: Olm 3.2.15

### Homeserver

matrix.casavant.org / synapse v1.97.0

### Will you send logs?

Yes