add treemap_with-without_values_template mock to flaky list

Author: etpinard

test/image/compare_pixels_test.js

@@ -102,6 +102,7 @@ if(allMock || argv.filter) {
 
 var FLAKY_LIST = [
     'treemap_textposition',
+    'treemap_with-without_values_template',
     'trace_metatext',
     'gl3d_directions-streamtube1'
 ];