Only fetch client and scp config on pages with file upload

The client and scp config ajax request only contain the settings for the
multi-file upload widget. So it doesn't need to be fetched unless the widget
exists on the page
Merge pull request #637 from greezybacon/issue/client-config-ajax

Only fetch client config on pages with file upload

Reviewed-By: Peter Rotich <peter@osticket.com>