gnome-shell started transitioning to gjs' object spacing rule,
i.e. `{foo: 42}` instead of `{ foo: 42 }`.
We have a much smaller code base than the shell and aren't using
a secondary "allowed-but-deprecated" configuration that allows a
gradual transition, so just pull the switch and update to the new
style.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell-extensions/-/merge_requests/240>