dnsapi/dns_namecom: probe the root zone with GetDomain instead of listing all domains

The domain list is paginated at 1000 entries per page and only the
first page was fetched, so accounts with more than 1000 domains never
found the root zone.

fix https://github.com/acmesh-official/acme.sh/issues/5051

dnsapi/dns_namecom.sh

@@ -153,10 +153,9 @@ _namecom_get_root() {
   i=2
   p=1
 
-  if ! _namecom_rest GET "domains"; then
+  # Probe each candidate with GetDomain (GET /v4/domains/{domainName}) instead
-    return 1
+  # of listing all domains: the list is paginated at 1000 domains per page, so
-  fi
+  # larger accounts never found their domain on the first page.
-
   # Need to exclude the last field (tld)
   numfields=$(echo "$domain" | _egrep_o "\." | wc -l)
   while [ "$i" -le "$numfields" ]; do
@@ -166,7 +165,7 @@ _namecom_get_root() {
       return 1
     fi
 
-    if _contains "$response" "$host"; then
+    if _namecom_rest GET "domains/$host" && _contains "$response" "\"domainName\":\"$host\""; then
       _sub_domain=$(printf "%s" "$domain" | cut -d . -f 1-"$p")
       _domain="$host"
       return 0