Bug 21583: Don't use Asset.js for external script files

To test:
1 - Enable Novelist in staff client:
    NovelistSelectStaffEnabled: Add
    NovelistSelectStaffProfile: anything
    NovelistSelectPassword: anything
    ( these don't need to be valid, just not blank )
2 - Pull up a record detail page in staff client
3 - View page source - search for ns2init.js
4 - You won't find it
5 - Apply patch
6 - Reload details
7 - Search page source for ns2init.js
8 - It loaded! Huzzah!

Signed-off-by: George Williams <george@nekls.org>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>

koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/detail.tt

@@ -1080,7 +1080,7 @@
         });[% END %]
     </script>
     [% IF ( Koha.Preference('NovelistSelectStaffEnabled') && Koha.Preference('NovelistSelectStaffProfile') && ( normalized_isbn || normalized_upc ) ) %]
-        [% Asset.js("https://imageserver.ebscohost.com/novelistselect/ns2init.js") | $raw %]
+        <script src="https://imageserver.ebscohost.com/novelistselect/ns2init.js"></script>
     [% END %]
     [% INCLUDE 'datatables.inc' %]
     [% Asset.js("lib/jquery/plugins/jquery.dataTables.columnFilter.js") | $raw %]