pomodoro: fix display_bar in python3

In python3 calling `encode` on a string will yield a `bytes` obj which
then leads to a status bar with escaped hex chars instead of the bars, i.e.
`Pomodoro [b'\xe2\x96\x89\xe2\x96\x89\xe2\x96\x8d ']` vs `Pomodoro [b'▉▉▍ ']`.

The fix in python2 is to call format on a `unicode` object vs a `str` (ansii)
object. This will work fine in python3 > 3.3 where the `u` prefix was brought
into python3.

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