Fix ignored test
Fix ignored test

`test_rewrites_root_relative_urls` is ignored by redefined.

moskvax/html-pipeline,kbrock/html-pipeline,github/html-pipeline,jch/html-pipeline,moskvax/html-pipeline,charliesome/html-pipeline,github/html-pipeline,kbrock/html-pipeline,jch/html-pipeline,gjtorikian/html-pipeline,terracatta/html-pipeline,terracatta/html-pipeline,gjtorikian/html-pipeline