Fix anchor links dropping query parameter

Signed-off-by: David Mehren <git@herrmehren.de>

public/js/extra.js

@@ -847,7 +847,7 @@ const anchorForId = id => {
   const anchor = document.createElement('a')
   anchor.ariaHidden = 'true'
   anchor.className = 'anchor hidden-xs'
-  anchor.href = new URL(`#${id}`, document.location).toString()
+  anchor.href = new URL(`${document.location.search}#${id}`, document.location).toString()
   anchor.innerHTML = '<i class="fa fa-link"></i>'
   anchor.title = id
   return anchor