[FIX] web_editor: change margin and resize handle icons on focus
[FIX] web_editor: change margin and resize handle icons on focus

The feature was lost because of a programmation error (use of this in
a non-binded function).

ygol/odoo,ygol/odoo,dfang/odoo,hip-odoo/odoo,dfang/odoo,ygol/odoo,ygol/odoo,hip-odoo/odoo,ygol/odoo,dfang/odoo,dfang/odoo,dfang/odoo,ygol/odoo,hip-odoo/odoo,hip-odoo/odoo,dfang/odoo,hip-odoo/odoo,ygol/odoo,hip-odoo/odoo