gnome3.mutter328: backport changes from 3.32

gsettings-desktop-schemas made the following change in 3.32[0]
> Change tablets'/touchscreens' "display" setting to "output" one
> with different semantics.

That coincides with GNOME/mutter#133[1]

This caused a segmentation fault in gala on Fedora[2]
> Settings schema 'org.gnome.desktop.peripherals.touchscreen'
> does not contain a key named 'display'

I haven't experienced said segfault here in NixOS but I don't see
a reason not to use the solution reached there, which was to backport
relevant change[1] to mutter 3.28.

[0]: https://gitlab.gnome.org/GNOME/gsettings-desktop-schemas/commit/c7eee129c6edbc1a5b121fa3327d83049325becb
[1]: https://gitlab.gnome.org/GNOME/mutter/merge_requests/133
[2]: https://bugzilla.redhat.com/show_bug.cgi?id=1700337