[polybar] Several fixes for ‘inbox-size’

- Make the header more robust. If we need to add more argumetns to the scsh
  command-line this will let us do that more easily in the future without having
  to change the header again.

- Don't ‘display’ the result of the call to ‘run’ because that should always be
  ‘0’, unless something went wrong. Regardless, it doesn't belong in the output
  of this program.

- Use ‘rx’ in Emacs to build the regular expression. This is easier to read,
  especially considering how many times a single ‘\’ has to be escaped (once for
  the string in scsh, and once more for the string in Emacs).

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