Fix a typo in a comment (we don't "omit" signals).
Fix a typo in a comment (we don't "omit" signals).

* vte.h: Fix a typo in a comment (we don't "omit" signals).

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