[livecd-cli-installer] fix incomplete call to write_x11_config

Merged Philip Müller requested to merge aadityabagga:master into master

Created by: aadityabagga

Forgot to add /install prefix required when configuring installed system with cli-installer.

write_x11_config function is present at https://github.com/manjaro/manjaro-tools/blob/master/lib/util-livecd.sh

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