Picked up voip/video call keeps ringing

### Steps to reproduce

1. Receive a call (tested from Android)
2. Accept from the timeline
3. Continue seeing overlay at the top of the screen showing an incoming phone

### Outcome

#### What did you expect?
Phone stops ringing when I pick up the call

#### What happened instead?
Phone continues ringing

I am going to label this as S-Major because the only way I can have a call is if I pick up the call from the overlay as well.

### Operating system version

_No response_

### Application version

1.6.8

### Homeserver

_No response_

### Will you send logs?

No

Start by reproducing the listed flow: accept the call from the timeline and check the incoming-call overlay. Trace the timeline acceptance and overlay entry points to determine why ringing remains active; done means accepting from the timeline stops both the ringing and the overlay without requiring a second acceptance.

Written by the indexing model from the issue text.