[web] Maintain scroll position when scrolled up on ChatMessageList
[web] Maintain scroll position when scrolled up on ChatMessageList

Summary: Chrome and Firefox do this automatically, but Safari does not

Reviewers: palys-swm, KatPo

Reviewed By: palys-swm

Subscribers: KatPo, zrebcu411, Adrian

Differential Revision: https://phabricator.ashoat.com/D96

Ashoat/squadcal,Ashoat/squadcal,Ashoat/squadcal,Ashoat/squadcal,Ashoat/squadcal,Ashoat/squadcal,Ashoat/squadcal