Fix wallpaper application

- The script was not applying the wallpaper after changing the theme,
  the issue is now fixed.

i3-themer

@@ -75,6 +75,7 @@ function restartApps(){
     pkill dunst
     xrdb ${CONFIG_PATH['xresources']}
     i3-msg restart
+    nitrogen --restore
     notify-send "Theme applied successfully!"
 }