UIView has 2 designated initializers: initWithFrame and initWithCoder,
which means either of them is going to be called, whatever the
constructor.

THus overriding init will cause creating new (and unnecessary)
observers.

Ref: https://community.jitsi.org/t/duplicate-delegate-calls/121051/6
Fixes: https://github.com/jitsi/jitsi-meet/issues/12892