app.ProgressBar: Disable line wrapping
app.ProgressBar: Disable line wrapping

Echoes change made to the corresponding C++ code in #1563 / 03043284.

MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3,MRtrix3/mrtrix3