Fixing tests for add_facility

Addressing: https://github.com/fle-internal/ka-lite-central/issues/98

Summary of changes:

* Change facility required decorator to forward to zone_id parameterized URL.
* Allow fuzzy range for query numbers.
* Strip whitespace from text.
* Remove extraneous / from a url.
* Remove login page title assert, as being missed during whole test suite even though present.

Testing:
* All automated tests now pass or are skipped.