[stream] Fix bug in _head()
[stream] Fix bug in _head()

gloob/vte-copy,rvu95/vte,jessevdk/vte,saitoha/vte-sixel,flaxandteal/gasket-vte,jessevdk/vte,flaxandteal/gasket-vte,rvu95/vte,aligo/vte,saitoha/vte-sixel,thestinger/vte-ng,aligo/vte,pjm0616/vte,jessevdk/vte,rvu95/vte,flaxandteal/gasket-vte,pjm0616/vte,rvu95/vte,flaxandteal/gasket-vte,gloob/vte-copy,saitoha/vte-sixel,gloob/vte-copy,thestinger/vte-ng,asivokon/vte-fx,asivokon/vte-fx,pjm0616/vte,aligo/vte,asivokon/vte-fx,jessevdk/vte,asivokon/vte-fx,thestinger/vte-ng