refactor

Author: derreisende77

src/main/java/mediathek/javafx/bookmark/BookmarkData.java

@@ -67,6 +67,10 @@ public boolean getSeen() {
         return this.seen.get();
     }
 
+    public boolean getNotSeen() {
+        return !this.seen.get();
+    }
+
     public void setSeen(boolean seen) {
         this.seen.set(seen);
     }

src/main/java/mediathek/javafx/bookmark/BookmarkWindowController.java

@@ -561,9 +561,7 @@ private void btnFilterAction(ActionEvent e) {
     filterState = filterState.next();
     switch (filterState) {
       case ALL -> filteredBookmarkList.setPredicate(_ -> true);
-      case UNSEEN -> filteredBookmarkList.setPredicate(film -> { // show only unseen
-        return !film.getSeen();
-      });
+      case UNSEEN -> filteredBookmarkList.setPredicate(BookmarkData::getNotSeen);
       case SEEN -> filteredBookmarkList.setPredicate(BookmarkData::getSeen);
     }