byobu: use "/usr/bin/env python" for shebang
Update submodule oh-my-zsh 5d97024...5f3e0cb

* oh-my-zsh 5d97024...5f3e0cb (2):
  > zshrc: use NULL_GLOB for run-help-* and do not call "autoload -U" (without args)
  > Fix "tmux show-window-options" for older tmux