[Fix #56] tmux, launch_msg()

tmux, launch_msg(): Socket is not connected is thrown due to an error by launch_ctl
By default tmux starts the first login shell available, so no need to force it

plugins/tmux/init.zsh

@@ -27,7 +27,7 @@ if (( $SHLVL == 1 )) && zstyle -t ':omz:plugin:tmux:auto' start; then
   if [[ -n "$session" ]]; then
     exec tmux attach-session -t "$session"
   else
-    exec tmux new-session "$SHELL -l"
+    exec tmux new-session
   fi
 fi