update systemd/udev groups

[Andrei-Pozolotin]

update update systemd/udev groups in scripts

https://github.com/random-archer/mkinitcpio-systemd-tool/blob/master/src/initrd-build.sh#L18

in order to suppress boot time warnings, such as:

Dec 10 18:32:17 work3 systemd-udevd[431]: /usr/lib/udev/rules.d/50-udev-default.rules:40 Unknown group 'render', ignoring
Dec 10 18:32:17 work3 systemd-udevd[431]: /usr/lib/udev/rules.d/50-udev-default.rules:41 Unknown group 'render', ignoring
Dec 10 18:32:17 work3 systemd-udevd[431]: /usr/lib/udev/rules.d/50-udev-default.rules:86 Unknown group 'kvm', ignoring
Dec 10 18:32:17 work3 systemd-udevd[431]: /usr/lib/udev/rules.d/50-udev-default.rules:88 Unknown group 'kvm', ignoring

[Andrei-Pozolotin]

see #87