[FIX] web_editor: fix background layers buttons

Example to reproduce:

Drop the "Cover" snippet and try to remove the background
image. Clicking on image button has to be done 3 times to land on the
correct result:

- First click removes image, but not filter and leaves both buttons
  checked
- Second click removes the filter and unchecks its button.
- Third click unchecks the image button.

It should be one click to remove image, filter and uncheck both buttons.

The goal of this commit is to prevent _applyOptions() from setting
background-image values if image is not optimizable. This filter will
solve the issues since empty values (badly parsed by getBgImageURL())
won't be added as background urls.

task-2312878

closes odoo/odoo#62984

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

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