widget: Simplify word-chars
widget: Simplify word-chars

Until we implement full UAX29 word boundary detection, let's simplify the
exception cases of ascii punctuation we don't want to include.

https://bugzilla.gnome.org/show_bug.cgi?id=730632

rvu95/vte,thestinger/vte-ng,thestinger/vte-ng,rvu95/vte,flaxandteal/gasket-vte,rvu95/vte,flaxandteal/gasket-vte,jessevdk/vte,saitoha/vte-sixel,saitoha/vte-sixel,saitoha/vte-sixel,thestinger/vte-ng,jessevdk/vte,jessevdk/vte,flaxandteal/gasket-vte,jessevdk/vte,flaxandteal/gasket-vte,rvu95/vte