lib/test/unit.rb: not override job_status option

* lib/test/unit.rb (Test::Unit::Runner#_prepare_run): not override
  job_status option if no tty.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@35748 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

lib/test/unit.rb

@@ -666,7 +666,7 @@ module Test
       end
 
       def _prepare_run(suites, type)
-        options[:job_status] ||= @tty && !options[:verbose] ? :replace : :normal
+        options[:job_status] ||= :replace if @tty && !@verbose
         case options[:color]
         when :always
           color = true