Call "Permission" has changed in RoomHeader compared to LegacyRoomHeader

### Steps to reproduce

- Create a DM Room with user A
- Set user A role to "default" (not admin)
- Connect with user A to the DM, the call button is greyed with message : "You do not have permission to start voice calls"

### Outcome

With [LegacyRoomHeader](https://github.com/matrix-org/matrix-react-sdk/blob/81c62e51c474581c3d3f0f1e72aa0d1eb26ac45a/src/components/views/rooms/LegacyRoomHeader.tsx#L354) we don't have this behaviour, the button is not greyed. Indeed, as there are 2 people in the room, it is enough to activate the button.

With [RoomHeader](https://github.com/matrix-org/matrix-react-sdk/blob/ea3067b14583911fd202df2f3d86057822e6132a/src/hooks/room/useRoomCall.ts#L82) the new permission logic greys the call button and the user A can not make calls.

What is the reason of this new permission logic?

### Operating system

_No response_

### Browser information

_No response_

### URL for webapp

_No response_

### Application version

_No response_

### Homeserver

_No response_

### Will you send logs?

No