Fix rapid7#7455, handle the URIPORT option properly in is_uxss_injection

Fix rapid7#7455

Author: wchen-r7

modules/auxiliary/gather/ie_uxss_injection.rb

@@ -81,7 +81,7 @@ def get_uri(cli=self.cli)
       host = "[#{host}]"
     end
 
-    if datastore['URIPORT'] != 0
+    if datastore['URIPORT']
       port = ':' + datastore['URIPORT'].to_s
     elsif (ssl and datastore["SRVPORT"] == 443)
       port = ''