decompose_tagmarkup: fix for python 3 + bytes
decompose_tagmarkup: fix for python 3 + bytes

rndusr/urwid,hkoof/urwid,drestebon/urwid,tonycpsu/urwid,rndusr/urwid,tonycpsu/urwid,zyga/urwid,tonycpsu/urwid,Julian/urwid,inducer/urwid,urwid/urwid,inducer/urwid,urwid/urwid,zyga/urwid,drestebon/urwid,wardi/urwid,ivanov/urwid,douglas-larocca/urwid,mountainstorm/urwid,zyga/urwid,foreni-packages/urwid,foreni-packages/urwid,foreni-packages/urwid,douglas-larocca/urwid,inducer/urwid,rndusr/urwid,ivanov/urwid,harlowja/urwid,douglas-larocca/urwid,westurner/urwid,bk2204/urwid,drestebon/urwid,Julian/urwid,harlowja/urwid,wardi/urwid,hkoof/urwid,Julian/urwid,hkoof/urwid,westurner/urwid,bk2204/urwid,bk2204/urwid,mountainstorm/urwid,mountainstorm/urwid,harlowja/urwid,ivanov/urwid,urwid/urwid,wardi/urwid,westurner/urwid