Fix rapid7#9109, HttpServer (TcpServer) backgrounding

Author: wvu

modules/exploits/unix/webapp/wp_mobile_detector_upload_execute.rb

@@ -41,7 +41,8 @@ def initialize(info = {})
       'Platform'        => 'php',
       'Arch'            => ARCH_PHP,
       'Targets'         => [['wp-mobile-detectory < 3.6', {}]],
-      'DefaultTarget'   => 0
+      'DefaultTarget'   => 0,
+      'Stance'          => Msf::Exploit::Stance::Aggressive
     ))
   end