wemux list nonfunctional from tmux ~3.0 onwards if no users are connected #78
Description
list_active_servers relies on tmux -S {sock} server-info returning a non-error; however, the underlying show-messages command started only returning that if clients were connected to it at some point around tmux 3 and only got a commit to fix that last week.
Replacing server-info with list-sessions should allow for wemux list to correctly identify "active" sockets without a terminal needing to be actively connected to it at the time.