[FIX] web_editor: trigger 'content_changed' event on correct elements

When 'data-apply-to' was introduced to be able to target different
elements for snippet option methods, we kept triggering the
'content_changed' event on the main option element. This can be a
problem if the main option element is not in an editable element and the
elements targeted by apply-to are, as that editable element would not
be marked as dirty.

Note: the bug could actually still be produced, even in Odoo <= 13.0
where the apply-to param does not exist, by using a option method
which searches by itself for an inner element in an inside editable
element. This is considered as a limitation for the time being.

Part of https://github.com/odoo/odoo/pull/52821

X-original-commit: 906b2d9d4679c03365f949633e3c90319724deb8

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