Ameba: Fix Lint/UselessAssign (#4795)

Related to issue 2231

src/invidious/user/imports.cr

@@ -124,7 +124,7 @@ struct Invidious::User
           playlist = create_playlist(title, privacy, user)
           Invidious::Database::Playlists.update_description(playlist.id, description)
 
-          videos = item["videos"]?.try &.as_a?.try &.each_with_index do |video_id, idx|
+          item["videos"]?.try &.as_a?.try &.each_with_index do |video_id, idx|
             if idx > CONFIG.playlist_length_limit
               raise InfoException.new("Playlist cannot have more than #{CONFIG.playlist_length_limit} videos")
             end