Fix padding-top on body added when JS is disabled
Fix padding-top on body added when JS is disabled

The padding is needed when the page header has position:fixed to provide
a space for it to start at. The fixed position only happens when JS is
enabled so made this also the case for the padding.

tadast/static,robinwhittleton/static,kalleth/static,robinwhittleton/static,alphagov/static,alphagov/static,robinwhittleton/static,tadast/static,tadast/static,kalleth/static,robinwhittleton/static,tadast/static,kalleth/static,alphagov/static,kalleth/static