[FIX] web_editor: command click goes through fix

Before this commit:

Previously, when opening a command bar below an image such that the command bar
was on the image, clicking on the command bar would select both the command bar
option and the image.

After this commit:

Clicking on the command bar no longer selects the image when it is beneath the
command bar.

Task - 3126311

closes odoo/odoo#118593

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