Fix a typo on the scripts

scripts/dual-boot.sh

@@ -1,8 +1,8 @@
+#!/usr/bin/env bash
+
 # This script install Redox in the free space of your storage device
 # and add a boot entry (if you are using the systemd-boot boot loader)
 
-#!/usr/bin/env bash
-
 set -e
 
 if [ -n "$1" ]