Fixed the issue#9946 (#10017)

* Fixed the issue#9946

The issue#9946 was occurring due to "?mode=ebooks" being default at some point in time earlier. Since that is not the case anymore, according to the openlibrary/openlibrary/templates/type/edition/view.html, the editions_limit was being assigned the value 10 always. This prevented the default value of editions_limit to be None (which is then used in  openlibrary/openlibrary/templates/type/work/editions_database.html).

The change includes the 'None' to be one of the acceptable states, restoring the originally intended logic.

* Revert "Fixed the issue#9946"

This reverts commit 5f45188.

* Fixing editions_datatable.html conditional statement

openlibrary/templates/type/work/editions_datatable.html

@@ -3,7 +3,7 @@
 $ book_keys = []
 $ edition_list_start = time()
 
-$if editions_limit or (len(editions) < work.edition_count):
+$if (editions_limit and len(editions) > editions_limit) or (len(editions) < work.edition_count):
   <p class="small sansserif featured-count">
 
     $ungettext('Showing %(count)d featured edition.', 'Showing %(count)d featured editions.', len(editions), count=len(editions))