fixed recursor address

pdns/config/pdns.conf

@@ -419,7 +419,7 @@ master=yes
 #################################
 # recursor  If recursion is desired, IP address of a recursing nameserver
 #
-recursor=PDNS_RECURSOR_HOST:53
+recursor=PDNS_RECURSOR_HOST
 
 #################################
 # retrieval-threads Number of AXFR-retrieval threads for slave operation