Dependency for libraries

Problem/Motivation

I noticed that the composer.json for fluidui requires that drupal/libraries is installed. But libraries is not a listed dependency in the info.yml file, and not having libraries installed did not impact whether it worked*, so I have been operating for a while where libraries is downloaded as part of the composer requirements but then not installed. That's not a significant problem but does mean a bit more time to build from composer, a bit more that needs updated, a bit more clutter in the list of extensions, and a bit of confusion why it is there without being installed.

* Maybe there's a connection between this and the issue since 2.0.2 with the beige background, but installing libraries did not fix that for me, so if it is related, it is more complicated than simply enabling it.

Proposed resolution

If it is not actually required, remove that requirement from the composer file. If it is actually required, add that dependency to the info file.