mate-themes: update to 3.22.15.
mate-themes: update to 3.22.15.

Closes: #11544 [via git-merge-pr]

necrophcodr/void-packages,necrophcodr/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,coredumb/void-packages,coredumb/void-packages,coredumb/void-packages,coredumb/void-packages,NeoChontrix/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,NeoChontrix/void-packages,NeoChontrix/void-packages,coredumb/void-packages,necrophcodr/void-packages,coredumb/void-packages,NeoChontrix/void-packages