tests: update regex check for fetch error in test-clonebundles.t On some systems, e.g. Docker container, the actual error may be: error fetching bundle: [Errno 99] Cannot assign requested address Update the regex to handle this case.

hgweb: use separate CSS class for navigation links in footer 2d93d2159e30 changed the styling of the "page_nav" CSS class to use flexbox to separate elements within the <div>. I didn't realize that this class was used outside of the links in the header. So this resulted in incorrectly formatting links in the footer of various pages. Fix that by introducing a new CSS class that preserves the old CSS behavior.

configitems: register 'ui.clonebundleprefers' as example for 'configlist' This exercise the default value handling in 'configlist'.