Enable load-session command from outside of Tmux

This means that "init" session layouts can now be used to start and/or
re-attach to your main session.

Personally I have a "main" session layout with a couple of default
windows. I can now either start that session, or re-attach to it from
outside of Tmux by just running `tmuxifier s main`, instead of manually
creating a session named "main" and then loading my windows into it.

lib/layout-helpers.sh

@@ -187,9 +187,6 @@ initialize_session() {
     local first_window_index=$(__get_first_window_index)
     tmux move-window -s "$session:$first_window_index" -t "$session:999"
 
-    # Ensure correct pane splitting.
-    __go_to_session
-
     # Session created, return ok exit status.
     return 0
   fi