Update dns_cf.sh

if CF_Zone_ID is used,  save it to domain conf instead.

dnsapi/dns_cf.sh

@@ -25,9 +25,15 @@ dns_cf_add() {
   CF_Email="${CF_Email:-$(_readaccountconf_mutable CF_Email)}"
 
   if [ "$CF_Token" ]; then
-    _saveaccountconf_mutable CF_Token "$CF_Token"
-    _saveaccountconf_mutable CF_Account_ID "$CF_Account_ID"
-    _saveaccountconf_mutable CF_Zone_ID "$CF_Zone_ID"
+    if [ "$CF_Zone_ID" ]; then
+      _savedomainconf CF_Token "$CF_Token"
+      _savedomainconf CF_Account_ID "$CF_Account_ID"
+      _savedomainconf CF_Zone_ID "$CF_Zone_ID"
+    else
+      _saveaccountconf_mutable CF_Token "$CF_Token"
+      _saveaccountconf_mutable CF_Account_ID "$CF_Account_ID"
+      _saveaccountconf_mutable CF_Zone_ID "$CF_Zone_ID"
+    fi
   else
     if [ -z "$CF_Key" ] || [ -z "$CF_Email" ]; then
       CF_Key=""