Switch error page to use shared template
Switch error page to use shared template

The error page had been making use of "chrome-empty-sidebar", which we're
trying to get rid of. This swaps that page's template for "chrome"

eregs/regulations-site,eregs/regulations-site,eregs/regulations-site,tadhg-ohiggins/regulations-site,tadhg-ohiggins/regulations-site,18F/regulations-site,18F/regulations-site,eregs/regulations-site,tadhg-ohiggins/regulations-site,18F/regulations-site,18F/regulations-site,tadhg-ohiggins/regulations-site