This commit aims to make it easier to remove a shape over a background image. Before this commit, we could only remove a shape by clicking on the "shape" button in the background options (it was not easy to find quickly), but with this commit we can now also remove it thanks to a "remove" button that has been added next to the shape selector. task-2827802 closes odoo/odoo#96788 Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>