Update html test reference files

haddock-api/resources/html/NewOcean.std-theme/new-ocean.css

haddock-api/src/Haddock/Backends/Xhtml.hs

html-test/ref/A.html

html-test/ref/B.html

html-test/ref/Bold.html

html-test/ref/Bug1.html

html-test/ref/Bug195.html

html-test/ref/Bug2.html

html-test/ref/Bug201.html

html-test/ref/Bug253.html

html-test/ref/Bug26.html

html-test/ref/Bug280.html

html-test/ref/Bug294.html

html-test/ref/Bug298.html

html-test/ref/Bug3.html

html-test/ref/Bug308.html

html-test/ref/Bug308CrossModule.html

html-test/ref/Bug310.html

html-test/ref/Bug313.html

html-test/ref/Bug335.html