fix https://github.com/Neilpang/acme.sh/pull/2553#issuecomment-546173277

dnsapi/dns_freedns.sh

@@ -349,7 +349,7 @@ _freedns_data_id() {
       return 1
     fi
 
-    data_id="$(echo "$htmlpage" | tr -d "\t\r\n\v\f" | sed 's/<tr>/@<tr>/g' | tr '@' '\n' \
+    data_id="$(echo "$htmlpage" | tr -d " \t\r\n\v\f" | sed 's/<tr>/@<tr>/g' | tr '@' '\n' \
       | grep "<td[a-zA-Z=#]*>$record_type</td>" \
       | grep "<ahref.*>$search_domain</a>" \
       | sed -n 's/.*\(edit\.php?data_id=[0-9a-zA-Z]*\).*/\1/p' \