Allow defaulting to following org.freedesktop.locale1 in livecd environment

Fedora issue: https://pagure.io/fedora-kde/SIG/issue/504

We typically achieve different behaviours between a live environment and an installed environment by populating a ~/.config file in the live image overriding the desired settings, so this could be implemented by toggling locale1 integration reading from ~/.config/kwinrc instead of or in addition to the --locale1 command-line option.