Idiomaticise the rubies

lib/rex/post/meterpreter/ui/console/command_dispatcher/incognito.rb

@@ -221,7 +221,7 @@ class Console::CommandDispatcher::Incognito
   end
 
   def system_privilege_check
-    if !client.sys.config.is_system?
+    unless client.sys.config.is_system?
       print_line("[-] Warning: Not currently running as SYSTEM, not all tokens will be available")
       print_line("             Call rev2self if primary process token is SYSTEM")
     end