[FIX] web_editor: properly convert svg shapes

When converting inline svg shapes to images, we checked if the source
ended with ".svg", which is not enough, as it can include query
parameters (eg, .svg?color=red). We now simply check if it includes
".svg" instead.

We also need to make sure we didn't make a clone of the image in an mso
before converting it, as the source wouldn't get converted in the mso.

closes odoo/odoo#125764

Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>