Expect space when regexp has an escaped space

Close #927

Author: tagliala

test/action_view/cases/test_form_for_helpers.rb

@@ -662,7 +662,7 @@ def test_field_with_format_space
     end
 
     def test_field_with_format_escaped_space
-      assert_field_with_format_has_source(:escaped_space, '\\ ')
+      assert_field_with_format_has_source(:escaped_space, ' ')
     end
 
     def test_field_with_format_ascii_escape

test/action_view/cases/test_form_with_helpers.rb

@@ -661,7 +661,7 @@ def test_form_with_field_with_format_space
       end
 
       def test_form_with_field_with_format_escaped_space
-        assert_field_with_format_has_source(:escaped_space, '\\ ')
+        assert_field_with_format_has_source(:escaped_space, ' ')
       end
 
       def test_form_with_field_with_format_ascii_escape