[FIX] web_tour: force tooltip content font style
[FIX] web_tour: force tooltip content font style

Force tooltip content font style (size, family, line-height, weight)
so that it does not depend on where the tooltip is in the DOM.

This fixes a problem where the style changed when opening/closing the
tooltip. Indeed, the content dimensions, computed in javascript when
the tooltip is closed were wrong because of the style and the opening
/ closing rely on these values.

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