Land rapid7#2123, mutiny_frontend_upload code cleanup

Author: wvu

modules/exploits/linux/http/mutiny_frontend_upload.rb

@@ -161,9 +161,6 @@ def exploit_native
 		elf_filename = "#{rand_text_alpha_lower(8)}.elf"
 		if upload_file(elf_location, elf_filename, elf)
 			register_files_for_cleanup("#{elf_location}/#{elf_filename}")
-			f = ::File.open("/tmp/test.elf", "wb")
-			f.write(elf)
-			f.close
 		else
 			fail_with(Exploit::Failure::Unknown, "#{@peer} - Payload upload failed")
 		end