added the missing '5' next to 'KDE Plasma'

Change-Id: I9a9b0d3b0198c7f37561b14cfeb55ec5a9d5bfe8
Reviewed-on: https://gerrit.libreoffice.org/13066
Reviewed-by: Jonathan Riddell <jr@jriddell.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Stephan Bergmann <sbergman@redhat.com>