[BUG][14.0] pos_product_template Problem when variants have different images than template

[antoniocanovas]

@pedroguirao , please review:

Steps to reproduce the behavior:

1. Create a product template with an image, and several variants.
2. Change variants images.
3. On pos environment variant images after selecting are good, but main image of product is "any" of variants.

Expected behavior:
The image in main pos must be the one of product.template, and after selecting each one of variants for product.product.

[github-actions]

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