[FIX] web_kanban: duplicated tags on load more
[FIX] web_kanban: duplicated tags on load more

When clicking on 'load more', the kanban view only needs to add tags
for new records displayed by load more ; the existing records already
have their tags so one duplicates them.

sysadminmatmoz/OCB,storm-computers/odoo,microcom/odoo,sysadminmatmoz/OCB,stephen144/odoo,stephen144/odoo,bplancher/odoo,sysadminmatmoz/OCB,storm-computers/odoo,microcom/odoo,sysadminmatmoz/OCB,hip-odoo/odoo,ygol/odoo,bplancher/odoo,sysadminmatmoz/OCB,ygol/odoo,Elico-Corp/odoo_OCB,sysadminmatmoz/OCB,bplancher/odoo,dfang/odoo,Elico-Corp/odoo_OCB,storm-computers/odoo,stephen144/odoo,dfang/odoo,bplancher/odoo,stephen144/odoo,Elico-Corp/odoo_OCB,microcom/odoo,hip-odoo/odoo,laslabs/odoo,hip-odoo/odoo,ygol/odoo,dfang/odoo,Elico-Corp/odoo_OCB,Elico-Corp/odoo_OCB,hip-odoo/odoo,ygol/odoo,dfang/odoo,ygol/odoo,storm-computers/odoo,ygol/odoo,storm-computers/odoo,laslabs/odoo,bplancher/odoo,Elico-Corp/odoo_OCB,laslabs/odoo,laslabs/odoo,hip-odoo/odoo,laslabs/odoo,microcom/odoo,laslabs/odoo,stephen144/odoo,sysadminmatmoz/OCB,dfang/odoo,stephen144/odoo,bplancher/odoo,microcom/odoo,dfang/odoo,ygol/odoo,storm-computers/odoo,microcom/odoo,hip-odoo/odoo