hgweb: use css for stripey background in coal
Since "
b8ecc3830c89 or
25dae11bb044::
c229a5e7511e" paper style used css for
stripes in background for browsing files, for listing branches/tags/bookmarks,
and so on.
Since coal borrows many paper templates (e.g. shortlogentry.tmpl), it actually
tried to do the same, but it didn't have the needed css classes. You can
compare https://selenic.com/hg?style=coal with
https://selenic.com/hg?style=paper and see how log view in coal style has plain
white background, unlike the one in paper style. This wasn't intended.
Let's copy css classes directly from style-paper.css and remove parity classes
from elements that don't need them anymore. This makes plain white background
have stripes again and makes coal/map even more similar to paper/map (which can
ease porting changes or %including paper/map in future).