Fix base_url issue

Fix issue about Warning : Undefined array key "path" in Drupal\rel_to_abs\Plugin\Filter\RelToAbs->absoluteUrl() ( 62 in

Since getSchemeAndHttpHost() just returns scheme & host (and not another potential part of the path, like <front> might) we don't need to mitigate that, so I've removed that logic.

I've also modified the functional test to use the same method for getting $base_url, and checked that the test passes.

Changing version here to 2.2.1, though it would be nice to have a 2.x-dev choice in the Version choices.

Reroll for latest dev. No other changes.
Thanks @podarok for adding 2.2.x-dev!

This has been made essentially moot by 📌 Automated Drupal 10 compatibility fixes Fixed .
Closing.