gsettings-desktop-schemas: update 47.1 -> 48.0

gsettings-desktop-schemas: update 47.1 -> 48.0

This update is required for gnome-control-center-48

Major changes in 48.0
=====================
- Translation updates
Major changes in 48.rc
======================
- Switch to JPEG for background image
- Translation updates
Major changes in 48.beta
========================
- Switch to Adwaita Fonts
- Split data recording and limits in time limits schema
- Set more useful defaults on stylus buttons
- Translation updates
Major changes in 48.alpha
=========================
- Add screen limits schema
- Fix gendered language in key descriptions

Signed-off-by: Markus Volk <f_l_k@t-online.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>