iOS falls asleep due to inactivity during Element Call

### Steps to reproduce

1. Start the call via Element Call with someone
2. Keep speaking / listening, without touching your phone (iPhone, any model)
3. The screen get locked; quite often - that also leads to the call being disrupted - so have to re-connect.

### Outcome

#### What did you expect?

Either or both:
1) The call to keep screen from locking
2) The call to handle that event.

#### What happened instead?

1) The screen is locked
2) Quite often, the call got disrupted

### Operating system

_No response_

### Browser information

_No response_

### URL for webapp

_No response_

### Will you send logs?

No