No ringback tone on outgoing calls (Element Android)

### Steps to reproduce

1. Start a 1-to-1 voice call.
2. Remote device rings.
3. Caller hears no ringback tone.

### Outcome

Element Android should play a local ringback tone when the call is in “dialing” / “ringing” state.

### Your phone model

Samsung Galaxy S21 Ultra

### Operating system version

Android 16

### Application version and app store

Element 1.6.48

### Homeserver

Synapse 1.144.0

### Will you send logs?

No

### Are you willing to provide a PR?

No