Add tmux attach -d alias (#5285)

plugins/tmux/tmux.plugin.zsh

@@ -3,6 +3,7 @@
 #
 
 alias ta='tmux attach -t'
+alias tad='tmux attach -d -t'
 alias ts='tmux new-session -s'
 alias tl='tmux list-sessions'
 alias tksv='tmux kill-server'