Revert "schemas: Add closing quotation mark for gschema values"
Revert "schemas: Add closing quotation mark for gschema values"

This reverts commit 3651ecb28a59dc705a69b34d2b04d519e104cf34.

Because, even though it doesn't show up in any UIs, we still can't break
the string freeze.

GNOME/gsettings-desktop-schemas,GNOME/gsettings-desktop-schemas