fix forgotten parenthensis

dnsapi/dns_ionos_cloud.sh

@@ -95,7 +95,7 @@ _ionos_cloud_get_record() {
   zone_id=$1
   txtrecord=$2
   # this is to transform the domain to lower case
-  fulldomain=$(printf "%s" "$3" | _lower_case
+  fulldomain=$(printf "%s" "$3" | _lower_case)
   # this is to transform record name to lower case
   # IONOS Cloud API transforms all record names to lower case
   _record_name=$(printf "%s" "$fulldomain" | cut -d . -f 1 | _lower_case)