test: fix wrong python script indentation

A previous chakra-specific customization of `test/message/testcfg.py`
introduced wrong indentation (42bc284).
This causes all `.chakracore.out` message tests be skipped instead of
customized.

Fixed the wrong indentation.

PR-URL: #54
Reviewed-By: Sandeep Agarwal <Agarwal.Sandeep@microsoft.com>

test/message/testcfg.py

@@ -134,7 +134,7 @@ def ListTests(self, current_path, path, arch, mode):
           if not exists(output_path):
             print "Could not find %s or %s" % (output_path, engine_output_path)
             continue
-          result.append(MessageTestCase(test, file_path, output_path,
+        result.append(MessageTestCase(test, file_path, output_path,
                                       arch, mode, self.context, self))
     return result