Fix Cookie Regresson in Lessons External Tool Import (Content Item)

By the way - this does not fail on localhost - only on a real server like nightly.  There is some documentation here: https://github.com/csev/sakai/blob/SAK-44809/basiclti/docs/IMPORTLOR.md This URL will change to a master URL when the Pull Request gets merged. Install an LTI tool https://www.py4e.com/tsugi/lti/store/   | 12345 | secret - make it an LTI 1.1 content item tool, send all the data, and only check the "Allow the tool to provide a common cartridge (usually to be imported into a tool like Lessons)" placement. Then go into (Lessons -> More Tools -> External Tool Import), select the tool and ask for an import.  Flash bang boom - you see the log in screen in the popup. Then make it an LTI 1.3 tool and do the import again.   Setting up LTI 1.3 on www.py4e.com might require some help from Chuck - or just have Chuck do it.  There are no "Lessons" on sakai.tsugicloud.org - which would be easier to test but it won't support the import / migration use case / protocol.