[FIX] point_of_sale: http fetch img require right headers

The pos must be in http to talk to the posbox
The problem here is that imgs can sometime be fetch in https depending on the server's configuration

Before this commit, when converting imgs to base64, a "Tainted canvas" traceback was thrown by the browser
due to difference in domain that http VS https make

After this commit, we explicitly allow cross origin when fetching the image
while requiring the server to send the right headers

OPW 805860

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