[FIX] web_editor: properly remove all bg when choosing a bg color

The code which removed the background image of a snippet when choosing a
background color worked kinda by chance. Indeed, on the final click on
the color option, the snippet background-image was reset... to the
current background-image, which is none thanks to the color preview.
Unfortunately, in some themes, the gradient color option interferes:
the current background-image at a color choice is equal to the current
gradient, and thus, that gradient is being moved as an inline style.

The bug was introduced with https://github.com/odoo/odoo/commit/285d95e946e5a15139c961e30dbe3598e0d99f6a
(as, before, the background reset was done by simulating a click on the
'background: none' option item, which was removed).

Closes https://github.com/odoo/odoo/pull/27808

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