Killed in background when call is active

### Steps to reproduce

1. Make a voice call
2. Put element into background
3. Wait
4. After a while, pick up the phone again and
5. switch back to element

### Outcome

#### What did you expect?
After 2, the call should always persist.

#### What happened instead?
After 4, the call indicator disappeared.
After 5, it is apparent that the app has been reloaded (interface went blank, then content appears). No call is shown as ongoing on my side. The other party of the call says they cannot hear me, but the call is shown as ongoing on their side.

### Your phone model

pixel 4 xl

### Operating system version

Android 11 (LineageOS 18.1, Jan 23, 2022)

### Application version and app store

element "1.13.15 [40103150] (F-e1ef0939)," olm 3.2.10, F-Droid.

### Homeserver

https://tusooa.xyz

### Will you send logs?
already sent