fix: user_id -> chat_id for unsub:

main.py

@@ -270,13 +270,12 @@ async def my_subs(callback: types.CallbackQuery):
 @dp.callback_query(F.data.startswith("unsub:"))
 async def unsub(callback: types.CallbackQuery):
     sid = int(callback.data.split(":")[1])
-    user_id = callback.from_user.id # ID того, кто нажал на кнопку
+    chat_id = callback.message.chat.id
 
     async with async_session() as session:
-        # Добавляем условие chat_id == user_id
         stmt = select(Subscription).where(
             Subscription.id == sid,
-            Subscription.chat_id == user_id,
+            Subscription.chat_id == chat_id,
             Subscription.deleted == False
         )
         result = await session.execute(stmt)