*: avantgarde, beauty, bistro, buzzy, clean, cobalt, graphene, kea, yes
This commit adapts the style attribute's add/remove operations in order
to avoid ending up with the same property defined several times.
task-4206845
Part-of: odoo/design-themes#933
Related: odoo/odoo#181194
Signed-off-by: Alice Gaudon (agau) <agau@odoo.com>