Let the "Enable Element Call as an additional calling option in this room" option also set the power level for `io.element.call.encryption_keys`

### Your use case

Hello,

for some time now, we have decided to use private encrypted rooms in our Element space with modified roles and permissions. Specifically, we make it possible to send messages only to moderators, as well as being able to invite someone, and other things. We do the same with those who can initiate a video call with Element Call: a moderator can start it, anyone can enter it. The issue is that with custom rules configuration, Element Call video calls do not work! The moderator can initiate Element Call video calls, the room members enter the video call, but are neither audible nor visible. The moderator sees the members connected to the videocall, but it is not possible to talk to them. This only happens in encrypted, private rooms with non-standard permissions and roles! In our opinion, this is a glitch that does not make the video call function of Element Call production-ready.

At your disposal.

### Have you considered any alternatives?

_No response_

### Additional context

_No response_