Enable XKB dead keys by default (#100)

* Enable dead keys by default

Co-authored-by: jens-maus <5887769+jens-maus@users.noreply.github.com>

Author: Copilot

buildroot-external/rootfs-overlay/etc/X11/xorg.conf.d/00-keyboard.conf

@@ -2,7 +2,7 @@ Section "InputClass"
 	Identifier	"Keyboard Defaults"
 	MatchIsKeyboard	 "on"
 	Option "XkbModel"   "pc105"
-	Option "XkbVariant" "nodeadkeys"
+	Option "XkbVariant" ""
 	Option "XkbLayout" "de,us"
 	Option "XkbOptions" "grp:sclk_toggle,grp_led:scroll"
 	Option "AutoRepeat" "500 30"

buildroot-external/rootfs-overlay/etc/init.d/S42LoadNetFiles

@@ -185,7 +185,7 @@ setup_xconf() {
   if [[ -n "${XKBMODEL}" ]]; then
     sed -i "/Option .*XkbModel/c\\\tOption \"XkbModel\" \"${XKBMODEL}\"" /etc/X11/xorg.conf.d/00-keyboard.conf
   fi
-  if [[ -n "${XKBVARIANT}" ]]; then
+  if [[ ${XKBVARIANT+x} ]]; then
     sed -i "/Option .*XkbVariant/c\\\tOption \"XkbVariant\" \"${XKBVARIANT}\"" /etc/X11/xorg.conf.d/00-keyboard.conf
   fi
   if [[ -n "${XKBOPTIONS}" ]]; then