Hometown performers make good and Lupe slays this year’s ONExONE benefit concert at Kool Haus. In the midst of the TIFF mayhem comes a solid hip-hop show, ONEx­ONE: a non-profit foun­da­tion com­mit­ted to helping children in need. The evening commenced with Toronto native, Melanie Fiona, who was accompanied with a DJ and two back up vocalists. Beatboxer, Scott …