Revert "Fixed identation in actionmailer base_test"

Please excuse the revert. Albeit the commit is totally
innocent, docrails has a strong no-code policy we need
to enforce. Please feel free to submit the fix as a
patch and assign it to me, I'll apply right away.

This reverts commit d8462510c5.

actionmailer/test/base_test.rb

@@ -153,8 +153,8 @@ class BaseTest < ActiveSupport::TestCase
     assert_equal(2, email.parts.length)
     assert_equal("multipart/related", email.mime_type)
     assert_equal("multipart/alternative", email.parts[0].mime_type)
-    assert_equal("text/plain", email.parts[0].parts[0].mime_type)
-    assert_equal("text/html",  email.parts[0].parts[1].mime_type)
+      assert_equal("text/plain", email.parts[0].parts[0].mime_type)
+      assert_equal("text/html",  email.parts[0].parts[1].mime_type)
     assert_equal("logo.png", email.parts[1].filename)
   end