overrides/Gio.js: Fix property setter
overrides/Gio.js: Fix property setter

This code was obviously never tested or run.

mtwebster/cjs,mtwebster/cjs,endlessm/gjs,mtwebster/cjs,magcius/gjs,djdeath/gjs,pixunil/cjs,magcius/gjs,djdeath/gjs,mtwebster/cjs,djdeath/gjs,endlessm/gjs,pixunil/cjs,endlessm/gjs,pixunil/cjs,endlessm/gjs,magcius/gjs,pixunil/cjs,endlessm/gjs,pixunil/cjs,mtwebster/cjs,djdeath/gjs,magcius/gjs,djdeath/gjs,magcius/gjs