BF: Dock.name() unicode fix

If Dock.label.text() contained non ascii chars (for example if it was
set to évènts_zàhéér ), then Dock.name() was causing an exception as the
non ascii characters can not be decoded by str().

Simply removing the str() conversion around the Dock.label.text() being
returned seems to fix the issue and work for str and unicode label.text
types.