[FIX] website_blog, *: restore blog/post cover edition

* web_editor, website

Editing the cover images or sizes was not working anymore. When it
worked, it was thanks to the 'o_dirty' class appearing magically on a
cover part... and that magic seems to be gone.

This commit fixes the problem by adding the 'o_dirty' class on all
elements whose content is changed, not only the editable ones (this is
the case for the blog cover: it is a non editable element whose bg
image can be changed).

Note: this also fixes the edition of multiple covers (of different blogs
or posts) at the same time (this could be backported in 12.0 if needed).

closes odoo/odoo#36999

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

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