[FIX] web_editor: fix small gaps between shapes and their environments

Because of the way browsers render SVGs as background images, background
SVGs will sometimes not perfectly hug the top or bottom of their
containers because of rounding in the calculation of the width from the
height, or height from the width.

This commit fixes a number of the shapes displaying this behaviour, by
making their viewbox a perfect square, this means that whenever the
width or height of the SVG is determined by the brower, it will use the
same number for the height or width respectively because the aspect
ratio is exactly one, rather than using the closest integer
approximation of the aspect ratio, which causes those artifacts.

task-2319484

closes odoo/odoo#56200

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

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