Fix MemoryError on get_input_media(game)

Because an integer was being passed where a TLObject was expected,
so the serialization with bytes() was actually requesting that many
bytes as opposed to properly converting the expected object.

telethon/utils.py

@@ -483,7 +483,10 @@ def get_input_media(
                 file=media, mime_type=mime, attributes=attrs)
 
     if isinstance(media, types.MessageMediaGame):
-        return types.InputMediaGame(id=media.game.id)
+        return types.InputMediaGame(id=types.InputGameID(
+            id=media.game.id,
+            access_hash=media.game.access_hash
+        ))
 
     if isinstance(media, types.MessageMediaContact):
         return types.InputMediaContact(