Fixes https://github.com/chatwoot/chatwoot/issues/13317
Fixes an issue where WhatsApp attachment messages (images, audio, video,
documents) were failing to download. Messages were being created but
without attachments.
The `phone_number_id` parameter was being passed to the `GET
/<MEDIA_ID>` endpoint when downloading incoming media. According to
Meta's documentation:
> "Note that `phone_number_id` is optional. If included, the request
will only be processed if the business phone number ID included in the
query matches the ID of the business
phone number **that the media was uploaded on**."
For incoming messages, media is uploaded by the customer, not by the
business phone number. Passing the business's `phone_number_id` causes
validation to fail with error: `Param phone_number_id is not a valid
whatsapp business phone number id ID`
This PR removes the `phone_number_id` parameter from the media URL
request for incoming messages.