Fix for newer powershell

Author: Meatballs1

lib/msf/core/post/windows/runas.rb

@@ -25,7 +25,7 @@ def execute_exe(filename = nil, path = nil, upload = nil)
   end
 
   def execute_psh
-    powershell_command = cmd_psh_payload(payload.encoded)
+    powershell_command = cmd_psh_payload(payload.encoded, payload_instance.arch.first)
     command = 'cmd.exe'
     args = "/c #{powershell_command}"
     shell_exec(command, args)