video,screeshare,listenonly: remove Safari gathering barrier for the SDP offer generation

Back when Safari 11 was still a thing, there was an annoying bug where peer connectiocs COULD get stuck during it`s JSEP handshaking phase if, due to some unknown trigger, the SDP was generated BEFORE the ICE candidate gathering had run its course.

I dont believe this is the case anymore and this workaround is _very_ harmful to Safari endpoints, mainly when gathering might take a long time due to additional network interfaces or restricted network environments. So its being removed.

Ive tested this with the widest array of Safari endpoints I could get my hands on: iPhones 8-12, iPads 6-8 and Pro, macOS Safari 12-14