edit /user/edit-archive.html template (thumbnail section).

This is preparation for implementing the update archive entry
thumbnail functionality in the web.lisp file.

templates/user/edit-archive.html

@@ -23,10 +23,10 @@
 </script>
 
 <img alt="{{db-data.title}}" src="/storage/thumb/archive/{{db-data.slug}}">
-<form action="edit/archive-thumbnail" method="post" enctype="multipart/form-data">
+<form action="/edit/archive-thumbnail" method="post" enctype="multipart/form-data">
     <input required type="hidden" name="AUTHENTICITY-TOKEN" value="{{token}}">
-    <input required type="hidden" name="SLUG" value="{{db-data.slug}}">
-    <input required type="file" name="THUMBNAIL-FILE">
+    <input required type="hidden" name="ARCHIVE-SLUG" value="{{db-data.slug}}">
+    <input  type="file" name="THUMBNAIL-FILE">
     <input type="submit" value="Change Thumbnail">
 </form>