Update prompt_paradox_setup

According to [Powerline Font Patching Documentation](http://powerline.readthedocs.org/en/latest/fontpatching.html), the special characters moved to the Unicode Private Use Area (the range goes from U+E000 to U+F8FF)

Newly [patched fonts](https://github.com/Lokaltog/powerline-fonts) use these new codes.

Updated the file with the specified changes to work with the new fonts.