fix broken shebangs in dns_scripts

Signed-off-by: jeffmerkey <jeffmerkey@gmail.com>

dns_scripts/dns_add_ionos

@@ -1,4 +1,4 @@
-#!/usr/usr/bin/env bash
+#!/usr/bin/env bash
 #
 # Called as
 #

dns_scripts/dns_del_ionos

@@ -1,4 +1,4 @@
-#!/usr/usr/bin/env bash
+#!/usr/bin/env bash
 #
 # Called as
 #