[release-8.x branch] Don't include blacklight js twice when using Sprockets #3372
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As @mamrey noted on #3263, this can lead to a user being unable to add bookmarks, since the relevant eventlistener is added twice, so every time the user clicks to add a bookmark, the toggle function is run twice, essentially doing nothing.
This bug (and fix) only affect Sprockets -- when using Importmap or Propshaft, this branch of the view isn't even reached.