Refactor theme module

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/user/configs/gui/theme/theme.sh

@@ -1,6 +1,9 @@
 [ ! -L "$CONFIG"/wallpaper ] && ln -sf "$DEFAULT_WALLPAPER" "$CONFIG"/wallpaper
 [ ! -f "$CONFIG"/mode ] && echo "$DEFAULT_MODE" > "$CONFIG"/mode
 
+WALLPAPER=""
+MODE=""
+
 set_wallpaper() {
   if [ -f "$1" ]; then
     WALLPAPER="$1"
@@ -35,14 +38,9 @@ finish() {
   [ -n "$WALLPAPER" ] && ln -sf "$WALLPAPER" "$CONFIG"/wallpaper
   [ -n "$MODE" ] && echo "$MODE" > "$CONFIG"/mode
 
-  {
-    "$SWITCH"
-  } > /dev/null
+  "$ACTIVATION" > /dev/null
 }
 
-WALLPAPER=""
-MODE=""
-
 if [ $# -eq 0 ]; then
   finish
 else