Fix or remove attach_library twig reference

[antbrown]

At the moment when viewing a FITS media entity I get the following warnings:

User warning: The following theme is missing from the file system: css in Drupal\Core\Extension\ExtensionPathResolver->getPathname() (line 63 of core/lib/Drupal/Core/Extension/ExtensionPathResolver.php).

Deprecated function: dirname(): Passing null to parameter #1 ($path) of type string is deprecated in Drupal\Core\Extension\ExtensionPathResolver->getPath() (line 85 of core/lib/Drupal/Core/Extension/ExtensionPathResolver.php).

I think this is being caused by an incorrect reference in the twig attach_library call, it should be module/library, so in this case islandora_fits/islandora_fits.

However, the library is already being attached correctly in https://github.com/roblib/islandora_fits/blob/8.x-1.x/src/Services/XMLTransform.php#L149, so the easiest solution might be to just remove the call to attach_library in the twig template?