Fix call button overlap in sidebar chat
Fix call button overlap in sidebar chat

Due to recent changes to the scroll component, the
call button in sidebar chat needs to be
adjusted to float on top of the chat.

Signed-off-by: Vincent Petry <87e1f221a672a14a323e57bb65eaea19d3ed3804@nextcloud.com>

nextcloud/spreed,nextcloud/spreed,nextcloud/spreed