[FIX] point_of_sale: Black receipts

Some parts of the receipts had a black background, making them
unreadable. The origin of this problem was that the white background
was not applied correctly to the whole receipt. The rest of the receipt
had a transparent background which was then changed to black when
converting the receipt to an image. The parts of the receipt that had
no background were the followings:

- The parts that were out of the screen if the receipt was too long.
We fix this by explicitly specifying a height when generating the
canvas.

- `html2canvas` applies the background to a rectangle starting from
(0, 0) up to (width, height). In our case, `body` has a margin of 8px.
Our receipt was then placed in a rectangle from (8, 8) to
(width + 8, height + 8).

closes odoo/odoo#37072

Signed-off-by: pimodoo <pimodoo@users.noreply.github.com>

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