support tmux split-pane when restoring processes with ps strategy
#518
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normally,
ps.shtakes the output oftmux list-panes -F "#{pane_pid}"and looks for all the children of that process with a controlling terminal, because that process is usually a shell. but if the process in a pane was spawned withtmux split-pane, it will have no parent process other than the tmux server itself.support this use case by falling back to the active process if the active process has no children with a controlling terminal.
fixes #517