mate-applets: update to mate-applets 1.22.2

Change log:

mate-applets 1.22.2

  * update translations
  * geyes: avoid memory leak
  * multiload: Use /proc/diskstats for NVMe drives
  * treat output as utf8 when limiting width.
  * Make cpufreq builds independent from kernel header version.
  * command: use MaCommand object
  * Make command applet run commands asynchronously
  * cpufreq: support kernel 5.1.0
  * weather: align Gtk_Box to center
  * multiload: filter-out non-local disks and user mounts

(gutteridge)