test_time.rb: arguments order

* test/ruby/test_time.rb (TestTime#test_marshal_zone_gc): fix
  the order of arguments.  expected value should come first.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45396 b2dd03c8-39d4-4d8f-98ff-823fe69b080e