use read/saveconf_mutable, not readconf from OVH

dnsapi/dns_online.sh

@@ -92,13 +92,13 @@ dns_online_rm() {
 ####################  Private functions below ##################################
 
 _online_check_config() {
-  ONLINE_API_KEY="${CF_Key:-$(_readaccountconf_mutable ONLINE_API_KEY)}"
+  ONLINE_API_KEY="${ONLINE_API_KEY:-$(_readaccountconf_mutable ONLINE_API_KEY)}"
   if [ -z "$ONLINE_API_KEY" ]; then
     _err "No API key specified for Online API."
     _err "Create your key and export it as ONLINE_API_KEY"
     return 1
   fi
-  if [ ! _online_rest GET "domain/" ]; then
+  if ! _online_rest GET "domain/"; then
     _err "Invalid API key specified for Online API."
     return 1
   fi