Fix raise error invalid argument

 - Kernel#raise takes caller string array as a third argument
 - But it appeared `reason` String passed while raising an error.
 - Reference https://ruby-doc.org/core-2.6.3/Kernel.html#method-i-raise

Signed-off-by: Vivek Singh <vivek.singh@msystechnologies.com>

lib/train/extras/command_wrapper.rb

@@ -169,8 +169,8 @@ def self.load(transport, options)
         res = LinuxCommand.new(transport, options)
         verification_res = res.verify
         if verification_res
-          msg, reason = verification_res
-          raise Train::UserError, "Sudo failed: #{msg}", reason
+          msg, _reason = verification_res
+          raise Train::UserError, "Sudo failed: #{msg}"
         end
         res
       elsif transport.platform.windows?