Improves gdl.sh and images-indexer.sh scripts

scripts/shell/gdl.sh

@@ -8,13 +8,11 @@ fi
 media_url=$1
 
 gallery-dl $media_url
-cmd_exit_code=$?
 
-if [[ $cmd_exit_code -ne 0 ]]; then
+if [[ $? -ne 0 ]]; then
     printf "\n"
 
     echo "[ERROR] `basename $0`: Could not download url \"$media_url\""
-    echo "[ERROR] Exit status: $cmd_exit_code"
 
     exit 1
 fi