dashboard(): rename & replace already_listed var

server/app.py

@@ -225,21 +225,21 @@ def dashboard():
     # config
     pinned_limit = 16
     media_limit = 24
+    already_listed = set[MediaElement]()
     # for links from pinned collections
     pinned_collections: Iterable[MediaCollection] = orm.select(
         m for m in MediaCollection if m.pinned and not m.ignored
     ).order_by(MediaCollection.release_date, MediaCollection.title, MediaCollection.id)
     links_from_pinned_collections: List[MediaCollectionLink] = list()
-    episodes_from_pinned_collections: Set[MediaElement] = set()
     for coll in pinned_collections:
         next_link = coll.next_episode
         if (
             next_link is not None
-            and next_link.element not in episodes_from_pinned_collections
+            and next_link.element not in already_listed
             and next_link.element.can_considered
         ):
             links_from_pinned_collections.append(next_link)
-            episodes_from_pinned_collections.add(next_link.element)
+            already_listed.add(next_link.element)
             if len(links_from_pinned_collections) >= pinned_limit:
                 break
     # for media