Since commit 2ecfed335d, m2x_tags_avatar
are based on dynamic.readonly to know if they are readonly or not. This
is a mistake, the only information that depends on dynamic.readonly is
the presence or absence of the popover.
In this commit, we'll set the initial value to readonly and add the
isEditable props that will tell iif you can delete or add records with
the popover.
closesodoo/odoo#116782
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>