Changes gdl-update-todo.sh to download only new files

scripts/shell/gdl-update-todo.sh

@@ -5,4 +5,4 @@ cd "$gallery_dl_path"
 
 urls=($(grep -Eo "(http|https)://[a-zA-Z0-9./?=_%:-]*" -i "$gallery_dl_path/todo.md"))
 
-for url in ${urls[@]}; do gallery-dl $url; done
+for url in ${urls[@]}; do gallery-dl --abort 1 $url; done