fix: re-subscription causes newly added torrent.bangumi_id is None

Author: KotaHv

backend/src/module/database/bangumi.py

@@ -17,6 +17,7 @@ def add(self, data: Bangumi):
         statement = select(Bangumi).where(Bangumi.title_raw == data.title_raw)
         bangumi = self.session.exec(statement).first()
         if bangumi:
+            data.id = bangumi.id
             return False
         self.session.add(data)
         self.session.commit()