get_real_instance_domain.sh: Fix optional curl arguments.

get_real_instance_domain.sh

@@ -4,7 +4,7 @@
 # running on <Your host> with access logging activated in order for this to
 # work.
 
-# Version: 2019-08-17_1
+# Version: 2020-06-08_1
 
 if [ -z "${2}" ]; then
     echo "Usage: ${0} <Your host> <Remote host> [additional curl options]" >&2
@@ -13,6 +13,7 @@ fi
 
 your_host="${1}"
 remote_host="${2}"
+shift 2
 
 if command -v md5sum > /dev/null; then
     uuid="$(date | md5sum | cut -d' ' -f 1)"