[fix] Replace leftover /root/install_opt strings with variable

setup/so-setup

@@ -318,7 +318,7 @@ if ! [[ -f $install_opt_file ]]; then
 	fi
 
 else
-	rm -rf /root/install_opt >> "$setup_log" 2>&1
+	rm -rf $install_opt_file >> "$setup_log" 2>&1
 fi
 
 short_name=$(echo "$HOSTNAME" | awk -F. '{print $1}')