🐛 small correction on db autosave

tools/db_auto_save.sh

@@ -8,10 +8,9 @@ mkdir -p "$BACKUP_DIR/$TIMESTAMP"
 if [ $ACTUAL_ENV = 'dev' ]; then
     docker exec -i mysql-maettleship mysqldump -u $DB_USER -p$DB_PASSWORD $DB_NAME > "$BACKUP_DIR/$TIMESTAMP/$DB_NAME.sql"
 else
-    db_user_file=$(cat ./secrets/db_user.txt)
     db_password_file=$(cat ./secrets/db_password.txt)
     db_name_file=$(cat ./secrets/db_name.txt)
-    docker exec -i mysql-maettleship mysqldump -u $db_user_file -p$db_password_file $db_name_file > "$BACKUP_DIR/$TIMESTAMP/$db_name_file.sql"
+    docker exec -i mysql-maettleship mysqldump -u $DB_USER -p$db_password_file $db_name_file > "$BACKUP_DIR/$TIMESTAMP/$db_name_file.sql"
 fi
 
 find "$BACKUP_DIR/" -type d -mtime +7 -exec rm -rf {} \;