there are not really reasons to not allow sending videochat invitations to the self chat:
- it is useful for testing
- one may forward them from there to somewhere else
- it is allowed on desktop and ios as well
in fact, i was very confused that it is not possible
when playing around with https://github.com/deltachat/deltachat-android/issues/3187 .
might be a relict where we did _only_ allow videochat in normal one-to-one chats.
adbenitez