fix: correct redirects for package actions & requests

For requests, we always pass a `next` of /requests, leading us
back to the requests page. For a standard package, we get redirected
to the involved pkgbase, or target pkgbase if a merge action was taken.

Signed-off-by: Kevin Morris <kevr@0cost.org>

templates/pkgbase/delete.html

@@ -45,6 +45,7 @@
 
         <form action="/pkgbase/{{ pkgbase.Name }}/delete" method="post">
             <fieldset>
+                <input type="hidden" name="next" value="{{ next }}" />
 
                 <p>
                     <label for="id_comments">{{ "Comments" | tr }}:</label>