fix for Overlay.keypress bug found by Andreas Klöckner
fix for Overlay.keypress bug found by Andreas Klöckner

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