fix: remove live-overlay home files causing root-owned .config dir

The live-overlay had /home/antergos/.config/plasma-org.kde.plasma.desktop-appletsrc
which got copied as root before configure_user() creates the live user.
useradd -m skips chown if the home dir already exists, leaving .config/
owned by root — Plasma then can't write kcminitrc, xdg-desktop-portal-kderc, etc.

Wallpaper config is already in /etc/skel/.config/ so useradd -m copies it
with correct ownership.

iso-profiles/antergos/live-overlay/home/antergos/.config/plasma-org.kde.plasma.desktop-appletsrc

@@ -1,11 +0,0 @@
-[Containments][1]
-activity=
-formfactor=0
-lastScreen=0
-location=0
-plugin=org.kde.plasma.folder
-wallpaperplugin=org.kde.image
-
-[Containments][1][Wallpaper][org.kde.image][General]
-Image=file:///usr/share/wallpapers/antergos-wallpaper/contents/images/antergos-wallpaper.png
-FillMode=2