add treemap_with-without_values to list of flaky mocks

Author: etpinard

test/image/compare_pixels_test.js

@@ -104,6 +104,7 @@ var FLAKY_LIST = [
     'treemap_coffee',
     'treemap_textposition',
     'treemap_with-without_values_template',
+    'treemap_with-without_values',
     'trace_metatext',
     'gl3d_directions-streamtube1'
 ];