widget: don't import mpdwidget any more
widget: don't import mpdwidget any more

ecd3123b4cdf7eef9f423cc69cc36bd48a0ab631 dropped the old mpd widget but
didn't drop this import. Let's drop this import as well.

Signed-off-by: Tycho Andersen <6b523322678240882acbb4da5312a12d8cd0082d@tycho.ws>

zordsdavini/qtile,zordsdavini/qtile