fix RPORT option

Author: medievia96

modules/auxiliary/scanner/http/owa_ews_login.rb

@@ -36,7 +36,7 @@ def initialize
         OptBool.new('AUTODISCOVER', [ false, "Automatically discover domain URI", true ]),
         OptString.new('AD_DOMAIN', [ false, "The Active Directory domain name", nil ]),
         OptString.new('TARGETURI', [ false, "The location of the NTLM service", nil ]),
-        OptInt.new('RPORT', [ true, "The target port", 443 ])
+        Opt::RPORT(443)
       ], self.class)
   end