Update dns_regru.sh

Fix incorrect root select (test.com.ru and subtest.com.ru)

dnsapi/dns_regru.sh

@@ -93,8 +93,8 @@ _get_root() {
 
   for ITEM in ${domains_list}; do
     IDN_ITEM=${ITEM}
-    case "${domain}" in
-    *${IDN_ITEM}*)
+    case ".${domain}" in
+    *.${IDN_ITEM}*)
       _domain="$(_idn "${ITEM}")"
       _debug _domain "${_domain}"
       return 0