Remove deprecated ActiveModel tests (%d and %s is no longer supported in error...

Remove deprecated ActiveModel tests (%d and %s is no longer supported in error messages a couple months already)

activemodel/test/cases/validations/i18n_validation_test.rb

@@ -21,20 +21,6 @@ def teardown
     I18n.backend = @old_backend
   end
 
-  def test_percent_s_interpolation_syntax_in_error_messages_was_deprecated
-    assert_not_deprecated do
-      default = "%s interpolation syntax was deprecated"
-      assert_equal default, I18n.t(:does_not_exist, :default => default, :value => 'this')
-    end
-  end
-
-  def test_percent_d_interpolation_syntax_in_error_messages_was_deprecated
-    assert_not_deprecated do
-      default = "%d interpolation syntaxes are deprecated"
-      assert_equal default, I18n.t(:does_not_exist, :default => default, :count => 2)
-    end
-  end
-
   def test_errors_add_on_empty_generates_message
     @person.errors.expects(:generate_message).with(:title, :empty, {:default => nil})
     @person.errors.add_on_empty :title