displaymanager: Switch to sddm on the ISO

Signed-off-by: Peter Jung <admin@ptr1337.dev>

archiso/airootfs/usr/local/bin/pkexec-wrapper

@@ -0,0 +1,10 @@
+#!/usr/bin/env sh
+exec pkexec env \
+    DISPLAY="$DISPLAY" \
+    HOME="$HOME" \
+    KDE_SESSION_VERSION="$KDE_SESSION_VERSION" \
+    WAYLAND_DISPLAY="$WAYLAND_DISPLAY" \
+    XDG_CURRENT_DESKTOP="$XDG_CURRENT_DESKTOP" \
+    XDG_SESSION_TYPE="$XDG_SESSION_TYPE" \
+    XDG_RUNTIME_DIR="$XDG_RUNTIME_DIR" \
+    dbus-launch "$@"